I am very much a hoarder - not so much sentimental stuff (I've got an old letter and a christmas card from an ex, that's about it), but, as Zippy pointed out, I do tend to keep stuff 'that might come in useful someday'.
Probably I've got a lot that can be binned (i.e. I've got a few modem cables and about three modems, despite not having used dial-up for years), but I have been vindicated recently when my IT setup started crapping out. A lot of 'might be useful' bits, such as an old 15GB HDD, actually did come in useful and things would have been a lot more awkward and expensive than was actually the case.
However, in the course of this I discovered a few bits that didn't actually work, or are too old to be of any use these days. So when I get round to tidying they'll be going in the bin. Contrary to what some people might believe

, I don't keep stuff that isn't any good.
I also keep a lot of paperwork - I got burnt once with insurance, I lost three years NCB because I couldn't prove I had it (threw away the renewal letter), so since then I've kept pretty much everything. It's not like it takes up much room.
Although I do have pretty much every payslip I've had since 1995, mainly for sentimental reasons more than anything (eg, "how the hell did I manage to live on that?!?")
