I have a doppleganger.
I just discovered that someone called tillerman has been writing a sailing blog called doublereef from early 2007, and what is apparently the same person has another blog called doublebeef which he has been writing for the last couple of months under the name Tillertard (with the occasional post over the tillerman moniker too).
I've no idea who this bloke is, except I know it's not me. Check him out. It's funny stuff.
Update: In the first version of this post I quoted a long extract from one of Tillertard/tillerman's blogs as an example of his writing. On reading the post from which I borrowed the extract a second time I realized that he was quoting another author. Oops. Never mind. My doppelganger writes good original stuff too.