I too seem to have acquired quite a pile of glass, without really trying. My first RF was a zorki (2, 3?) like the old SM leicas, with it came the standard collapsible industar elmar clone. I also picked up a sticky 80/2, and a nice light 135/4. After deciding that I liked this RF business, I managed to score a beat up M3, in good working condition. 6 months later I had a lens to match-summilux v1- And it was all downhill from there.
Currently (not counting fixed lens RF)
M: VC 15/4.5(w/M adapter) 50/1.4(v1), 50/2 (DR), 90/2 (v2), and 135/2.8
SM: (Canon) 85/2, 135/3.5 (Nikon) 35/2.5 and Summarit 50/1.5
Also, it seems to be picking up speed, all of the screwmount lenses (except the 15) and the IIIf to put them on were all purchased this year (2008) I'm also considering adding a 28 or a 21 to the mix.
Oddly enough, I tend to shoot one lens, one body. Every now and then I'll take a second body and lens. (one fun recent combo IIIf w/85, M3 w/15) If I'm feeling really adventurous, I'll throw and extra lens into my bag. Usually though, it's just one camera. Mostly the M3, but more and more the IIIf.