Does Banshee fetch album art? I really don't know. What I do is to include the album art in the id3 tags for each track using Easytag (it's in the repositories). It's a bit tedious as you have to tag each track on each album - if not already tagged. But then Banshee picks up the images automatically. And other players do, including my Sony PS3.
Where to get the images? If you purchase albums from Ubuntu One Music Store or Amazon, the images are included already. I guess that's so for other mp3 stores, but U1 and Amazon are the only ones I have experience of.
Where to get suitable album jpegs? A google search (google "download album art free") threw up this site:
http://www.coverhunt.com/
Note what it says at the bottom of the page, though, in very small type in an inconspicuous colour:
Or you could scan your own CD covers to jpegs - a resolution of about 300x300 is all you need. Legal? I don't know, but so long as you don't sell the jpegs and the scans are for your own use, I can't see a moral objection.
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