Hey Jon
Thanks for the insight. Sounds like it is a wheel bearing problem because when Im driving in a straight line and turn the wheel slightly to the left the humming goes completely away. Silent. Go straight again and its back.

So is this just a matter of replacing the wheel bearing? Would it be a good idea to replace the wheel bearings on all four wheels? The sound seems like it only comes from the rear...can I probably get away with just replacing the rear wheels bearings? Would I get these wheel bearings from hondaland?

My cars alignment is slightly off too so Ill probably get an alignment real soon. Does it matter what I do first (alignment/replacement of bearings)?

Thanks Jon.

Thanks for everyones input.