I just went through all of the Wu-Tang solo albums and listed all of the posse jams. They have 19 duets/posse jams from Tical to Ironman, which are the solo albums that the T/S said we shouldn't count because they "are solo projects".
1. Meth vs Chef - Method Man feat Raekwon (Tical)
2. Rawhide - ODB feat Method Man and Raekwon (Return of the 36 Chambers)
3. Snakes - ODB feat Buddah Monk, Killer Priest, Master Killer and The RZA (Return of the 36 Chambers)
4. Knuckleheadz - Raekwon feat Ghostface Killer and U-God (Only Built For Cuban Linx)
5. Guillotine (Swordz) - Raekwon feat Ghostface, Inspectah Deck and GZA (Only Built For Cuban Linx)
6. Glaciers of Ice - Raekwon feat Ghostface and Masta Killa (Only Built For Cuban Linx)
7. Ice Cream - Raekwon feat Cappadonna, Method Man and Ghostface Killah (Only Built For Cuban Linx)
8. Wu Gambinos - Raekwon feat RZA, Ghostface, Method Man and Masta Killah (Only Built For Cuban Linx)
9. Duel Of The Iron Mic - GZA feat Old Dirty Bastard, Dreddy Kruger, Inspectah Deck, Master Killah (Liquid Swords)
10. Cold World - GZA feat Inspectah Deck (Liquid Swords)
11. 4th Chamber - GZA feat Ghostface Killah, Killah Priest and RZA (Liquid Swords)
12. Shadowboxin - GZA feat Method Man (Liquid Swords)
13. Hell’s Wind Staff - GZA feat Dreddy Kruger, Killah Priest and Master Killah (Liquid Swords
14. Investigative Reports - GZA feat Ghsotface Killah, Raekwon, and U-God (Liquid Swords)
15. Assasination Day - Ghostface feat Inspectah Deck and RZA (Ironman)
16. Winter Warz - Ghostface feat Raekwon, Cappadonna, Masta Killah, U-God (Ironman)
17. Box In Hand - Ghostface feat Method Man (Ironman)
18. Black Jesus - Ghostface feat U-God (Ironman)
19. After The Smoke Is Clear - Ghostface feat RZA (Ironman)
You could burn these songs onto a CD-R and call it a Wu Tang album.