I've nearly lost my own, and the stylus on our company's loaner many times.

I accidentally left my stylus in San Diego when I went to the Santa Clara event, luckily guitar picks work well as a replacement.

On another note, the stylus on the n900 is probably it's lamest hardware feature beyond the weak kickstand. Even if I don't lose it I just *know* it will end up getting broken like nearly every other plastic stylus I've encountered.