Anyway, coming back to DVDs, I don't have a huge number of them, so it wouldn't be too hard to retype them all somewhere else. I did think about creating my own website (linking to a back-end database) for this, but I figured I should have a look around for an existing site first, rather than re-inventing the wheel (particularly if I want other people to enter their data). I found DVDLender, which looks pretty good: the idea is that you can belong to multiple "gangs", and only people in the same gang as you can see what you've got. This means that I can have different gangs for different circles of friends, without needing any transitive relations between them. You can then search for a DVD, it will show you everyone who has a copy, and you can click a button to ask to borrow it.
It's a free site, and seems to have been set up out of genuine goodwill, rather than as a money-making scheme. (They get commission from Amazon sales, but that's all.) Having said that, I'm not sure how much it's maintained, and from a technical point of view I can see several areas for improvement; also, the DVDs I've picked at random from my own collection aren't in their central list yet, so it will take a bit longer to add them. Still, I think it's worth playing with, so "if you wanna be in my gang" then just let me know. Alternately, if you know of any better sites elsewhere, I'd be interested to hear about them too.
Meanwhile, speaking of videos, here are a couple of good YouTube clips that I saw on Peter David's blog recently:
* March of the Emperor - very funny.
* Pandas - quite cute, although you'll need to have sound turned on to get the full effect.
Edit: PaperbackSwap seems to work on a similar principle, although it's only for the US, and arranges donations between strangers rather than temporary loans between friends.