yep, Apple and all its devotees will blame your router, no matter how illogical that is... I threatened to report Apple to the Department of Fair Trading here in Australia, and I've been in contact with local newspapers until Apple finally couldn't get out of the corner I backed them into after they insisted I bring in my router for testing even though it works perfectly with a load of other devices - Once they suggested I bring the router in to be tested I said there'd be 1 of 2 outcomes: either the router is at fault or not. If the latter they'd have to agree the iPad wifi design is flawed, and if the former, given it works with a dozen other devices, then they'd have to agree ipad can't work with a very common Netgear router.
So, finally, after nearly a full year, and 2 weeks before the warranty ran out, Apple sent me an airport express for free, which has fixed the problem.
So the only reliable solution is to buy more apple products...I bet you wouldn't have bought the ipad if you knew you'd also have to buy an apple router to make it work reliably, right?
Good luck...
to the usual suspects, thanks for all the help you provide here - but being a Windows user, I guess I've been spoilt by its Plug n Play technology all these years, and tweaking router settings (not that it worked for me anyway) is something I've been saved from. :-)