I remember being jealous I couldn't use Trillian because I didn't have a way to pay for it. Running AIM, ICQ and MSN all at the same time.

Ah man, it was glorious. I was really just in awe at how I could talk to all my various friends in one app, regardless of which platform they were on. Such a great app. I recently went to the webpage for the app and see it's sort of a shell of its former self and is some sort of business tool now. Kind of a bummer, but such fond memories of how amazing it was back in the peak of the various instant messaging tools, before unlimited text messaging was an affordable option.