For great acoustic straight ahead playing.... check out any of his work on the album (cd?) Echoes of Harlem/There Was A Time (on Enja, I believe). Great rhythm section featuring Kenny Barron and Cecil McBee. As an added bonus, he does two solo saxophone tracks on the cd.
He's featured on a John Scofield cd (for about half of it) called "Hand Jive" and his work on that is excellent.
For some of his best known funkier work, check out "Freedom Jazz Dance" and "Listen Here". On the cut "Listen Here", my recollection is that he utilizes a very unique, characteristic Eddie Harris device. He plays a short vamp in the low end of his horn and answers with a melodic phrase in the middle or upper register of his horn. He'll do this for a while and the effect is to set up a killer groove for himself... it seems like he's trading 4's (or whatever length, probably 2's) with himself and also accompanying himself. Very grooving and exciting!
Mike