Right on schedule -- if they stick to 2 week schedules! -- Apple has released iPhone SDK for iPad Beta 3. It's available now via developer.apple.com and if the past is any indication, we should be seeing the code explored and any new and interesting finds tipped and posted... well, from now until Beta 4 hits!
Go get it!
UPDATE: Or now, Apple seems to have pulled Beta 3 for now. Let us know if you still see it, if it's gone for you, or if it comes back!