MPC Beats as mentioned up thread is quite good for multisampling, and is free, the one thing that I would change about it is to have sampling determined by note length rather than time, other than that no complaints.
Sampling phrases is also something worth doing with analog synths, you can sample a few takes maybe with slightly different settings to add variation.
The other thing quite nice to do is sample a single sound and use the samplers synthesis functions to make a new sound, OT excels at this but plenty of other samplers like PT, Deluge, MPC etc can do interesting things with single note samples.
Sampling is probably my favourite technique outside of analog synthesis and I think they combine both ways very nicely - sample analog synths, and running samples through analog filters etc.
One of my fave techniques is an old staple, sample a fairly long analog synth sample where the filter is being swept by the envelope then play the sample back at different start points for some nice animation.
Drum synthesis is also something I am very fond of, every modular and non modular analog synth can often be used to make interesting percussion.