Here's a fairly updated list, copied and pasted from the 30th AC forum. The Hoth R2-unit and the post-WM BADs aren't in there yet, but I think character-wise (not counting R2 and R5-D4, it's complete).
1. R5-X2 (Jabba’s prequel)
2. R5-J2 (ROTJ Death Star offscreen)
3. R5-F7 (Lt. Lepira EIV)
4. R5-D2 (Star Tours)
5. R4-E1 (Bo Shek’s)
6. R4-M9 (Star Tours)
7. R4-A22 (E2 Dexter’s)
8. R4-I9 (E4 Death Star)
9. R4-M9 (E4 Devastator)
10. R2-B1 (E2)
11. R2-Q5 (E6 Death Star II)
12. R3-D3 (Star Tours)
13. R2-R9 (E1 Amidala’s)
14. R4-G9 (ROTS Obi-Wan’s)
15. R3-T7 (AOTC Coruscant)
16. R2-M5 (Naboo)
17. R2-D2 (Marvel)
18. R4-P17 (ROTS Obi-Wan’s)
19. R3-Y2 (Hoth Rebel)
20. R4-M6 (Mace’s Clone Wars)
21. R2-C4 (Amidala’s)
22. R2-X2 (E4 Theron Nett’s / Red 10)
23. ARC-170 Astromech (EU Clone Wars)
24. R2-A6 (Ric Olie’s)
25. R2-KT (EU)
26. R2-Q2 (Biggs’)
27. R3-A2 (Hoth Rebel)
28. R3-T6 (E4 Death Star)
29. R4-K5 (E3 Vader’s offscreen)
30. R3-T2 (E4 Mos Eisley)
31. R2-T0 (E1 Watto's)
32. R4-H5 (EU Kit Fisto's)
33. R4-F5 (EU Plo Koon's)