Absolution is great, but just not the classic album they're capable of. 'Sing For Absolution' is a very powerful song, as is 'Butterflies And Hurricanes' (though, in a completely OTT fashion, NME said it was the most powerful song ever written or some other such garbage). TSP and Time Is Running Out are also standouts. The SmallPrint has come a long way since they played it a few years ago on the live circuit, but it still sounds very nice.
Speaking of Muse I got three cds of B-sides/Unreleased/Live tracks off E-bay. £27. Absolute bargain if you're a Muse fan. 59 songs, most of which are very listenable. Obviously you'll have heard some of them if you have the singles and 'The Hullabaloo Soundtrack' but its well worth it IMO.