Some people get blurry scroll bars and some people don't because apparently the anti aliasing of some software's graphics are done by the graphics card, and some cards produce blurry anti aliasing and others do not. Check it out.
http://brycekerley.net/mp/2007/3/11/antialiasing-quality-on-macs
http://brycekerley.net/mp/2007/3/11/antialiasing-quality-on-macs