I have use fp100b and fp100c quite a lot, but mostly in 4x5 format on a crown graphic. I have used it on an rb too, but not so much. I also like fp3000b and posted an example of that somewhere. These are all great films.
Fp100c is great fun for emulsion lifts, you just take a shot, develop it normally, then throw that in boiling water for a few mins. The emulsion floats off and is quite durable- it can be gently stretched and mounted on paper or enlarged etc., though it gets crinkly after being floated off and dried.
Here is a recent shot I took on 4x5 fp100c with the crown graphic. Young friend all spiffed up for his first prom:
http://keithwilliamsphoto.net/noah.jpg
These instant prints have amazing resolution- actually, they can be scanned and enlarged quite substantially.