Along the same lines...
The "DownLoad ALL" does not work well.

I am trying to download the movie K-PAX right now with 1.7c.
I search and 100 duplicate files come up, but when I DownLoad ALL - Limewire picks one - tries to download - and if it fails - I'm out of luck.

On these BIG files and using previous version of Limewire (ie. 1.3/1.4), you could actually download multiple copies of the same file with the same name.
If multiple copies started to download - then I would kill the slower ones. If you ended up completing multiples - then they would overwrite one another (so what).

Why not allow us to download multiples and eliminate that annoying message ("You are already downloading file xxx.xx").
Or at least don't pop that message up until it is actually starts downloading (not just connecting to ip address).