I've noticed three in particular that are worthy of attention. (That doesn't mean there aren't more; I just haven't run across them yet.)
Over at TWIC, Mark Crowther presents a biography, complete with tables of some of his notable performances and a large, downloadable selection of his games (without annotations).
At ChessVibes they offer a profile, combined with reactions from Peter Heine Nielsen and Yasser Seirawan. Both the ChessVibes profile and TWIC also link to a beautiful 64-page document produced by the Danish Chess Federation to celebrate the occasion of Larsen's 75th birthday, earlier this year. The only problem (for most of us) is that it's in Danish, but we can all appreciate the pictures and games. (And if you're patient, you can get a decent idea of the text using Google Translate or some similar program.)
Finally, ChessBase remembers Larsen here, but the best material is in this earlier post from March (again, celebrating his 75th birthday). It includes - among many other things - a fascinating interview conducted back in 1998. Worth reading!