Yeah having the exact same problem, just says download is ongoing then after about 5 mins just says download unsuccessful.

 

Yes I had this last night too. Now I can download everything apart from the two things I wanted to download last night which keep coming up with error measages.

 

I've fixed this. Just go to Manage Applications and clear data on Android Market.

 

I've been having the same problem and have tried every single thing that has been suggested to others and nothing works. I dont want to reset my phone, but nothing is working

 

been having same problems with everyone above...cant seem to download anything 2day =_=...it worked yesterday =S...also tried StevenSeed suggestion....it still didnt work for me...but thanks anyways =)...hope it will be up and running soon!!!

 

I could download some things earlier and not others. I have to clear cache but still having problems. I doubt there is anything you can do. Just clear your cache and wait.