Just one ID?

OpenID crops up quite often in the blogosphere. While I can see the point to a certain degree, there are also issues of merging upmteen accounts into one. Stephen Downes is a strong advocate, though I can see the points that Langhoff raises in the comments regarding security (particularly after the news of the loss of two crucial discs in the UK, and issues surrounding data in Facebook BBC and The Independent). Now, it seems that the idea of a Universal avatar is being worked on by IBM and Linden Labs.