Egosoft, producer of both the X2 and the X3 space simulators, will now be selling both products on Valve’s Steam for $29.95 a pop.  From the Egosoft email newsletter:

In order to bring both X²: The Threat and X³: Reunion to the widest
possible audience, there is now a new way to buy them that means you
don’t even have to leave your seat. Just head over to Steam where you
can purchase both games for download directly to your PC. No more
disks and an excellent price.
Since the Steam version does not include a registration code, access
restrictions on forums and downloads relating to X³: Reunion have been
lifted.

This is great news for lovers of space sims.  Available now.