I think a really useful feature would be a "buffer". What it could do is play a song while it downloads, kind of like a streaming video. I think it would be useful for when you are downloading lots of new music, you could buffer it and hear it before its done, and see if you like it. This could also work for video files.

It has a Preview function. About the same thing right??

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I Don't Suffer From Insanity, I Enjoy Every Minute of it

No it aint. The preview option is the biggest mistake in Lime. It only shows the part you have downloaded (by that I mean it dosent always start with the beginning). It shows as much as is downloaded and stops. Buffering on Lime would replace the online free buffering video sites like joox, atleast for the people who have pro, because of the D-rate.