In an attempt not to be too flippent, yes! This one.
Seriously though there are thousands of problems (VBA and non-VBA) together with there solutions. Most important i find though is the discussion that leads to the solution and the alternative ideas that get thrown in (some good - some not so) by the many help and friendly folks here.
It's not a tutorial site if that is what your after though.
Another site I go to occasionally is OzGrid. If you find any other good sites then please let us know here.