it is very complicated to customize your site from within vBulletin if you use the generic full-tabled style. as example, the last site i coded, thcfarmer... the designer knew nothing of vBulletin when he draw the site look... so i had to handle tons of modifications of his style to make it fit the default vBulletin -- because i wanted the site to be very easy to upgrade...

vB 4.0 will be CSS based, like we plan for ages... but again, a lot of people will complaint that CSS is hard to handle... because there is always a ton of people not interested to learn. they want turnkey "custom"..