This has been passed down from my GreatestJournal account (now expired) and has since been much expanded on. HTML is rather useful to know, so this makes a good reference:
In all cases, replace [ and ] with < and >.[img src="yourimagepostedhere.jpg"] = Posts your JPG or other picture file from your computer.
[img src="http: //anothersite.jpg] = Posts picture image from another site.
[lj user="wolfmoon72"] =
![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
wolfmoon72[lj comm="news"] =
![[site community profile]](https://www.dreamwidth.org/img/comm_staff.png)
dw_news[font face="verdana"]verdana font[/font] =
verdana font[font face="times"]times font[/font] =
times font[font face="ariel"]ariel font[/font] =
ariel font[b]bold[/b] =
bold[em]emphasis[/em] =
emphasis[i]italics[/i] =
italics[u]underline[/u] =
underline[s]strikethrough[/s] =
strikethrough[marquee]scrolling text[/marquee] =
[font size="8"]The size of your font is 8.[/font] =
The size of your font is 8.[a href="
http://www.myspace.com/frznghost"]Jonathan's MySpace.[/a] =
Jonathan's MySpace.[a href="mailto:frznghost@yahoo.com"]E-mail Jonathan![/A] =
E-mail Jonathan![lj-cut text="Click me!"]Why did you click me, anyway?[/lj-cut] =
( Click me! )Here's some more html crap. Simply remove the spaces after the "&" symbol to get the stated effect.Name Code; Number Code; Glyph Description& lsquo; ‘ left single quote
& rsquo; ’ right single quote
& sbquo; ‚ single low-9 quote
& ldquo; “ left double quote
& rdquo; ” right double quote
& bdquo; „ double low-9 quote
& dagger; † dagger
& Dagger; ‡ double dagger
& permil; ‰ per mill sign
& lsaquo; ‹ single left-pointing angle quote
& rsaquo; › single right-pointing angle quote
& spades; ♠ black spade suit
& clubs; ♣ black club suit
& hearts; ♥ black heart suit
& diams; ♦ black diamond suit
& oline; ‾ overline, = spacing overscore
& larr; ← leftward arrow
& uarr; ↑ upward arrow
& rarr; → rightward arrow
& darr; ↓ downward arrow
& trade; ™ trademark sign
& quot; " " double quotation mark
& amp; & & ampersand
& lt; < < less-than sign
& gt; > > greater-than sign
& ndash; – – en dash
& mdash; — — em dash
& nbsp; nonbreaking space
& iexcl; ¡ ¡ inverted exclamation
& cent; ¢ ¢ cent sign
& pound; £ £ pound sterling
& curren; ¤ ¤ general currency sign
& yen; ¥ ¥ yen sign
& brvbar; or & brkbar; ¦ ¦ broken vertical bar
& sect; § § section sign
& uml; or & die; ¨ ¨ umlaut
& copy; © © copyright
& ordf; ª ª feminine ordinal
& laquo; « « left angle quote
& not; ¬ ¬ not sign
& shy; soft hyphen
& reg; ® ® registered trademark
& macr; or & hibar; ¯ ¯ macron accent
& deg; ° ° degree sign
& plusmn; ± ± plus or minus
& sup2; ² ² superscript two
& sup3; ³ ³ superscript three
& acute; ´ ´ acute accent
& micro; µ µ micro sign
& para; ¶ ¶ paragraph sign
& middot; · · middle dot
& cedil; ¸ ¸ cedilla
& sup1; ¹ ¹ superscript one
& ordm; º º masculine ordinal
& raquo; » » right angle quote
& frac14; ¼ ¼ one-fourth
& frac12; ½ ½ one-half
& frac34; ¾ ¾ three-fourths
& iquest; ¿ ¿ inverted question mark
& Agrave; À À uppercase A, grave accent
& Aacute; Á Á uppercase A, acute accent
& Acirc; Â Â uppercase A, circumflex accent
& Atilde; Ã Ã uppercase A, tilde
& Auml; Ä Ä uppercase A, umlaut
& Aring; Å Å uppercase A, ring
& AElig; Æ Æ uppercase AE
& Ccedil; Ç Ç uppercase C, cedilla
& Egrave; È È uppercase E, grave accent
& Eacute; É É uppercase E, acute accent
& Ecirc; Ê Ê uppercase E, circumflex accent
& Euml; Ë Ë uppercase E, umlaut
& Igrave; Ì Ì uppercase I, grave accent
& Iacute; Í Í uppercase I, acute accent
& Icirc; Î Î uppercase I, circumflex accent
& Iuml; Ï Ï uppercase I, umlaut
& ETH; Ð Ð uppercase Eth, Icelandic
& Ntilde; Ñ Ñ uppercase N, tilde
& Ograve; Ò Ò uppercase O, grave accent
& Oacute; Ó Ó uppercase O, acute accent
& Ocirc; Ô Ô uppercase O, circumflex accent
& Otilde; Õ Õ uppercase O, tilde
& Ouml; Ö Ö uppercase O, umlaut
& times; × × multiplication sign
& Oslash; Ø Ø uppercase O, slash
& Ugrave; Ù Ù uppercase U, grave accent
& Uacute; Ú Ú uppercase U, acute accent
& Ucirc; Û Û uppercase U, circumflex accent
& Uuml; Ü Ü uppercase U, umlaut
& Yacute; Ý Ý uppercase Y, acute accent
& THORN; Þ Þ uppercase THORN, Icelandic
& szlig; ß ß lowercase sharps, German
& agrave; à à lowercase a, grave accent
& aacute; á á lowercase a, acute accent
& acirc; â â lowercase a, circumflex accent
& atilde; ã ã lowercase a, tilde
& auml; ä ä lowercase a, umlaut
& aring; å å lowercase a, ring
& aelig; æ æ lowercase ae
& ccedil; ç ç lowercase c, cedilla
& egrave; è è lowercase e, grave accent
& eacute; é é lowercase e, acute accent
& ecirc; ê ê lowercase e, circumflex accent
& euml; ë ë lowercase e, umlaut
& igrave; ì ì lowercase i, grave accent
& iacute; í í lowercase i, acute accent
& icirc; î î lowercase i, circumflex accent
& iuml; ï ï lowercase i, umlaut
& eth; ð ð lowercase eth, Icelandic
& ntilde; ñ ñ lowercase n, tilde
& ograve; ò ò lowercase o, grave accent
& oacute; ó ó lowercase o, acute accent
& ocirc; ô ô lowercase o, circumflex accent
& otilde; õ õ lowercase o, tilde
& ouml; ö ö lowercase o, umlaut
& divide; ÷ ÷ division sign
& oslash; ø ø lowercase o, slash
& ugrave; ù ù lowercase u, grave accent
& uacute; ú ú lowercase u, acute accent
& ucirc; û û lowercase u, circumflex accent
& uuml; ü ü lowercase u, umlaut
& yacute; ý ý lowercase y, acute accent
& thorn; þ þ lowercase thorn, Icelandic
& yuml; ÿ ÿ lowercase y, umlaut
If I find more html references, I'll add them here. 
