Personally I prefer bossa nova jazz so I'll recommend from this area of jazz.
any of A.C Jobim tunes are great (Buy A.C Jobim Songbook for superb preformnces of most of his famous tunes).
If you're new to jazz the start with the simpler one's - like "How Insensitive" and "The Girl From Ipanema".
later on try "Wave".
"all the things you are", "Blue Bossa" and "autumn leaves" are very recommended also.
Practice on 1-6-2-5 and 2-5-1 progressions which are very common.
Also - don't forget that in order to become a resonable jazz guitarist you have to listen - alot - so here are some great jazz players for you to start with -
Wes Montgomery is great! - I recommend you to listen to him alot.
also try trumpet players like charley parker & Miles davis.
sorry about the mess : )
Omri