Not sure exactly how many I have... so I'm estimating. I have every single episode of babylon 5 including the B5 movies, every episode of the first 8 seasons of Stargate SG-1, seven seasons of Buffy, the first season of the new BSG, all of the firefly episodes, the prisoner series, a couple of seasons of family guy, the sopranos, probably a couple hundred feature movies, and quite a few other television series episodes that are scattered around (such as several episodes of the muppets, lots of stuff from nick at night and tv land, etc).
Basically, all of my DVD's are archived and put in storage, plus I converted a lot of VHS stuff as well as new recordings. I think I only have a handful of non-mainstream stuff (my wedding, my baptism, etc).
I have a dedicated PC with a RAID 5 array exporting just under a terabyte of storage to my network. It also streams my music collection via mt-daapd. I have a dedicated HTPC running mythtv under Ubuntu linux that mounts my video storage remotely and that's how I watch everything. I rarely put a DVD in my DVD player. It gets ripped, added to the server, and the DVD goes into storage before I watch it as a general rule.
I'm sure I have more in there, I am doing this from memory.
HTH.
-- Gary F.
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Eeyore, Original Owner -- Mk II 80 Gb, Blue
S/N #090000803
Tigger, 2nd Owner -- Mk IIa, 80 Gb, Blue
S/N #40103789