haloscan has limited smileys available.
anyway if you want someone else other than :) and ;), click on the "?" beside the "comment" text entry box. if you hover on the "?" you should see "smiley and tag help".

yay. a few more smileys to brighten up the commenting box! :D <-- i wish they had this one.

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ok i just realize it's NOT working!? here's the help list then:
:) smiley face
;) wink
:( angry face
:lol: laughing face
:o( sad face
8) sunglasses
:?: just a question mark
:+: thumbs up
:-: thumbs down