I've tested this will a vanilla WordPress 3.0.1 using the default TwentyTen theme and a simple paging form. I get "jQuery is not defined" errors showing up in firebug. I don't see any ill effects because of it... but it does arise my curiosity.
jQuery is not defined
http://testbed.local/contact/#gf_1
Line 21
line 21 is "</head>"