Thanks to Scott Beale I now have a Yahoo! Mash profile. I also have invites if you need one. It would be helpful if mash included a way to invite from a vcard file, but otherwise it seems pretty cool.
UPDATE Ok so I know this is still in beta, but the fact that Yahoo's own service flickr's module has now broken my RSS feed link is somehow pleasantly ironic:
Invalid URL: http%3A%2F%2Fapi.flickr.com%2Fservices%2Ffeeds%2Fphotos_public...
I should point out that it did work this morning.
UPDATE 2 I have added a few friends and none of them show up in my friends list, although I show up in theirs. Odd.
UPDATE 3 Ok I get it, the friends don't show up until they've claimed and set up their profiles. There are some pretty cool little modules, I like the twitter feed.