Here's TotalGaming.net's official reply.
Stellar Frontier was discontinued on the old Drengin.net/TotalGaming.net service back in July 2004, which is why it doesn't appear in Stardock Central. There's really no easy way for us to add this game back to SDC, as it's no longer for sale through our network (though is still for sale standalone via the Stardock Store). As for Bugs 2002, that title was never publically released outside of beta and has been cancelled - hence the beta version is no longer available.

So to sum up, neither game will be appearing on SDC again.
In terms of server/network status, when there's going to be a known interruption, we do post about it in advance on our forums. However, when a server goes down, this is usually impossible (since it brings down the site as well), in which case we work towards restoring service asap (and it's usually within a few minutes if it happens during the workday).
For the TopWare releases (and other upcoming games on TGN), I have been making pre-announcements on the TotalGaming.net forums, either in the PC Gaming forum or in the Open Talk forum. Doesn't get more open than that, since we're contractually not able to announce games before they're signed and we can only add signed games once their developer makes them available to us.

Certainly, when someone asks about it in the forums, we post a reply with the answer as soon as we can.
Lastly, SDC will be getting more work done to it in the future.
Thanks for your comments and glad to hear you enjoy TotalGaming.net.