For any of your readers that would like to accept OpenID on your website to facilitate registration, login, and building rich user profiles, check out the resources at the OpenID Foundation website: http://openid.net/add-openid/add-getting-started/
For anyone looking for a turnkey managed solution that includes not only OpenID but also Facebook, MySpace, Hotmail, Windows LiveID, Twitter, etc., check out JanRain's RPX - http://rpxnow.com and the social publishing capabilities https://rpxnow.com/demo/social to let your site users share their activitie with friends on Facebook, Yahoo, Twitter, and MySpace.
Implications of using your Google ID to log in elsewhere
On the downside, Google will be able to see which sites you sign in to at what particular moment in time. That fits nicely with Google's business model of generating ad revenue from "event" date of their users, but some users may be reluctant to have their online behavior tracked even more. Also, Google will be able to log in as you into all of your accounts where you sign in using your Google ID; even if you trust Google's employees to not abuse this capability, can they make their service secure against hackers who seek to abuse the same capability?
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