Almost forgot:

` and ~

Which brings it to 94 in total . . .

Yes?

Stuart :D

backslash
dagger, daggerdbl
copyright, registered, trademark
quotesinglbase, quotedblbase
elipsis
perthousand
guilsinglleft, guilsinglright, guillemotleft, guillemotright
quotedblleft, quotedblright, quoteleft, quoteright
bullet
endash, emdash
exclamdown, questiondown
cent, sterling, florin, Euro, yen, currency
section
ordfeminine, ordmasculine
logicalnot, plusminus, mu, divide
paragraph
periodcentered
acute, dieresis, cedilla
agrave, aacute, acircuflex, atilde, adieresis, aring, ae
ccedilla
egrave, eacute, ecircumflex, edieresis
igrave, iacute, icircumflex, idieresis
ntilde
ograve, oacute, ocircumflex, otilde, odieresis, oslash, oe
ugrave, uacute, ucircumflex, udieresis
ydieresis
Agrave, Aacute, Acircuflex, Atilde, Adieresis, Aring, AE
Ccedilla
Egrave, Eacute, Ecircumflex, Edieresis
Igrave, Iacute, Icircumflex, Idieresis
Ntilde
Ograve, Oacute, Ocircumflex, Otilde,Oodieresis, Oslash, OE
Ugrave, Uacute, Ucircumflex, Udieresis
Ydieresis
germandbls
degree

That's 81 more.

Depending on what you're after, some of these may not be useful. For instance, people using Central European keyboard layouts won't be able to access some of these characters, but they all exist in both MacRoman and Windows ANSI. Also, some people may not be able to figure out how to type a lot of these, even if they are accessible.

In any case, it might be best to stick with characters that can be typed using only shifted and unshifted keys. That would rule out most of what I've listed above (except the backslash), at least on US keyboards.