OK, folks. We've got a new contender to add to our list of social tagging / collective bookmarking sites. In SEO, the more the merrier, but in that industry, you're only as strong as your community. Shoutwire (the newcomer) is pretty cool, though. Cool enough that they've already suffered through a spam attack by rival Digg users (who feel threatened?) - very odd stuff.

So, a list of social tagging sites now includes:

• Del.icio.us
• Digg
• Furl
• Shoutwire
• Oh, and there's a heap more in the also-ran category

If they can all send traffic, then I'm a fan of all of them.