About that last bit, I just wanna say that don't be surprised if you end up with some uploads pending for months then the next thing you know it is downloaded. Things also depend on if the uploading peer is even connected or not.
If the file that you are downloading is not a very popular one then if it "Needs More Sources" might be because the few people that have the file are disconnected.
You'll just have to wait (again) for them to reconnect.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-