This greatest hits album from Timbuk3 is a good representation of their best. Plus you get the bonus track "Assholes on Parade" which has some of PatMac's best and most aggressive harmonica work.
If you'd like to find out where Timbuk3's gone since "The Future's So Bright..." from their debut "Greetings From Timbuk3", check out this album. Since their earliest CDs are no longer available (or hard to find), this may be your only chance to get some of their "Eden Alley" and "Edge of Allegiance" work on CD.