I'll second everybody on Mr. Campbell's list and add three other piano trios:
1) the early Nat King Cole Trio (which is available in a number of compilations, I believe);
2) "Money Jungle": Duke Ellington, Charles Mingus, and Max Roach--definitely on my shortlist for greatest piano trio recording ever;
3) Jacky Terrasson's first 2 albums (the eponymous one, and "Reach").
1) the early Nat King Cole Trio (which is available in a number of compilations, I believe);
2) "Money Jungle": Duke Ellington, Charles Mingus, and Max Roach--definitely on my shortlist for greatest piano trio recording ever;
3) Jacky Terrasson's first 2 albums (the eponymous one, and "Reach").