Favorite Tribute Albums?

. . . Timeless, the Hank Williams tribute CD, had some interesting covers by some great artists.  (I bought that one for Cold Cold Heart covered by Lucinda Williams, but it also featured Bob Dylan, Johnny Cash, Sheryl Crow, Keb Mo, Beck, Mark Knophler with EmmyLou, Tom Petty, Keith Richards, Ryan Adams and Hank III.)

Oops.  On edit, I see that the OP already picked Timeless, but I second that nomination.

. . . Steve Earle also did a tribute to Guy Clark which he titled Guy, and I honestly was not familiar with Guy Clark's work, but I did like Earle's tribute CD.

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I'm Your Fan, The Songs of Leonard Cohen - Various artists covering Cohen's songs.

Can't Steal My Fire:  The Songs Of David Olney. 

I didn't know anything about David Olney until EmmyLou covered Deeper Well on Wrecking Ball back in '95.  On the tribute Lucinda covers Deeper Well.  Steve Earle covers Sister Angelina and there is a 1977 live recording of Townes van Zandt  covering Illegal Cargo.