Currently, not very many.
SLR:
Nikon F5 (actually in my hands, as in, I can grab it and shoot with it)
Nikon F FTn (2/3rd's paid off - should be paid off by the weekend and then shipped out next week)
Pentax Super A (bought this for a friend - still need to get the paperwork necessary to cross the border into Canada and deliver it to him)
off-topic:
1 Canon point 'n shoot mainly used for film camera pr0n.
In the past, I've owned up to 13 cameras at a time.
In January 2006:
Nikomat FTn parts camera
Nikkormat FT2
Nikomat FT2
Nikon F
Nikon F2A x2
Nikon F3HP
Nikon F3P
Nikon F4
Nikon FM x2 (one black, one chrome)
Nikon FM2n x2 (one parts camera, one frankenstein camera)
Minox IIIS
I think the happy medium for me will probably be three Nikon film bodies. My F5, my old F2AS, when I get it back, and my F FTn.
Since 1984, I've owned:
4 Pentax H3v/SV cameras (three H3v's, one SV)
5 Pentax Spotmatic cameras (two SP, two Honeywell 1st gen, one Spot F parts cam)
3 ME Supers (two worked, one didn't)
Super A
SF10 - didn't work
2 Nikkormat FT bodies (one working, one donor)
24 Nikkormat/Nikomat FTn bodies (some functional, some parts)
16 Nikkormat/Nikomat FT2 bodies (same as above)
4 Nikkormat FT3 bodies
3 Nikkormat/Nikomat EL bodies (two worked, but weren't that great, one had dead cells)
3 Nikon FE bodies (one worked, two parts)
2 Nikon FE2 bodies
9 Nikon FM bodies (some parts, some ok)
3 Nikon FM2 bodies (early model - one good, two parts)
22 Nikon FM2n bodies (two parts bodies)
13 Nikon F bodies (two junkers)
12 Nikon F2 bodies
12 Nikon F3 bodies (two Press versions included, and two parts cameras)
15 Nikon F4 bodies
5 Nikon F5 bodies
2 Hasselblad 500c bodies
1 Hasselblad 500EL body (junker - came with an 80/2.8 T* that was good)
2 Leica R4 bodies
1 Minox IIIS
168 cameras since December 1st, 1984. Between 1984 and 2004, I'd owned ten total. One of the Pentax H3v bodies, three Nikkormat/Nikomat FTn bodies, a Nikkormat FT2, an FM2n, two FM's, the Minox, and one of the F3P bodies. Cameras started exploding in early 2005 for me. Discovered that I could try something for two months, get bored, then get something else. Usually, a week or so later, I'd miss the old item and either get it back or get one just like it. Still doing it, I see.
-J