Raw script tags within tiddlers are not interpreted by default (though
it is possible with InlineJavascriptPlugin*).
This sort of thing should probably go into either of these shadow tiddlers:
MarkupPreHead
MarkupPostHead
MarkupPreBody
MarkupPostBody
I remember there was a blog posting on how to use Google Adsense with
TiddlyWiki not too long ago, but I can't seem to find that anymore...
HTH.
-- F.
Sorry, I've never tried AdSense myself - try searching the group archives.
By the way: The blog posting I'd mentioned was on Google Analytics, not
Google AdSense:
http://tinyurl.com/24vsbp
(http://www.hawksworx.com/journal/2007/07/05/tracking-tiddlywiki-with-google-analytics/)
Might still give you some clues though...
-- F.