Jurij Gianluca Ricotti from MacWorld Italia has sampled his Roland TR-808 and made them available in Battery, HALion, Kontakt, LM-4 MK I and II formats for Free.
Apparently other banks will be available soon, TR-909 will be here next month. Professional TR-808 32-bit-96kHz samples and Banks is in progress.
Find HALion 7 in the KVR Marketplace