Apparently trend Micro purchased Hijack This utility.

Here is the post on the official HijackThis homepage from the developer:

As some of you might have seen several IT news websites are offering Trend Micro HijackThis 2.00 beta. An official statement will be posted on their website soon, but since this is a public beta of theirs I figured it’d be best if I answered the question I’m going to get asked a lot, right now.
This is not fake, I sold HijackThis to TrendMicro. Their product incorporates all changes, updates and fixes that I was planning on adding in the v1.99.2 release. I made sure of that and I hope no one will be disappointed with it.
While TrendMicro does not officially support HijackThis yet, I expect they will once it goes final.

I sold HijackThis because I had been sitting on an unfinished update for over a year and I still could not make enough time to finish it. My uni classes are taking up a lot of time and I want to set my goals a bit wider than just the antispyware business (though I still love it). Sitting on an unfinished product until it becomes obsolete is not useful, so I decided to transfer the responsibility to TrendMicro (who have also taken care of my CWShredder) so they can give it proper attention and support. Where the will take HijackThis, I do not know - but I am sure they will respect its goals and what it stands for.