Well read this http://ask-leo.com/are_limited_user_accounts_effective.html
I always run as Adm., with no UAC either, but if other users were around I would set up more accounts for sure. To fix inconveniences try Surun http://www.wilderssecurity.com/showthread.php?t=196737
Download and look at readme.txt, tells you difference to Runas and why to use this instead. Dont think that much malware is targeted towards "fixing" limited user. Too troublesome I would think. Clickjacking - how can it protect since a web-event? Browser might but output from whatever exploits, downloads/installations or what matters it does protect against.
Found a nice guide to Surun http://www.dedoimedo.com/computers/surun.html
and more 20 pages of forum-chitchat http://www.wilderssecurity.com/showthread.php?t=196737
If you only want to set up a personal "Im an idiot" account for browsing then may be not so important with Surun, but if other people are involved you must avoid those problems Leo dude talk about. Or focus will be on problems not benefits and away it goes, like UAC on Vista