Adding Cover Art to iTunes
Adding Album Cover Art to iTunes
I had fooled around with doing this once or twice before, but didn't find it intuitive. So to save you the trouble of figuring it for yourself, here's a short tutorial.
1) Open iTunes and select an entire album (using the shift or control key to select multiple songs) and then right click to open the "Get Info" dialog box.
2) Open a browser window with the album cover art you want, and click and drag the image over to iTunes. Hover over the iTunes button in your task bar and the "Multiple Song Information" box will pop open.
3) Now simply release your mouse over the empty Artwork panel and click OK. Then respond “Yes” to “Are you sure you want to change the artwork for multiple items?” question.