Here are some useful links on pages with tons of wavs for your sampler. I tried to elminate the lower quality samples for trackers. Everything here should be 16-bit, 44,1 kHz wavs or high quality mp3s.
Juno 106, Waldorf Pulse, Waldorf Microwave, Oberheim Matrix 1000
Loops, sound effects
Drums, drums and drums
... and more links will come soon ...