Remember the first time you realized that not all of your friends used the same instant messaging service? If you were on AIM and they were using MSN messenger you either had to sign up for a new service and run two desktop applications or shoot them frequent emails. And then came Trillian, one of the first programs to let users interact with contacts on multiple IM networks from a single application.

Over the years, other applications joined the party, including Pidgin, Miranda, and Digsby. And Trillian sort of fell out of the limelight. Two and a half years ago the company began alpha testing its next generation instant messenger called Trillian Astra. But it's been locked away behind an invite-only wall ever since.

And this week Lifehacker noted that pretty much anyone who signs up for a beta invite is being sent one almost immediately. That means two things. First, if you want to check out Trillian Astra, you can likely do it now. Second, a public release is probably coming soon. I could be wrong on the latter point, but I don't think so.

The latest version of Trillian Astra adds support for social networking services including Facebook and Twitter as well as instant messaging services, which means it could give Digsby a run for its money. Right now only a Windows version of the chat client is available, but OS X and iPhone versions are in the works as well. If you sign up for a beta invite, you may get a notice one of these days letting you know that those versions are available for download.