[pdntspa]

Supreme Commander is a great start

Personally, I'd also recommend Homeworld and the Warhammer 40K: Dawn of War series

On the free-and-open-source front there is Zero-K (which I don't care for) and Beyond All Reason, both of these are Spring Engine games, and Spring Engine started out as a 'modernization' of Total Annihilation. Most games built with it don't fall too far from the original

Homeworld 3 comes out in May, I can't wait :D :D :D

ps- I'd be remiss to omit Command & Conquer... Red Alert 2 and Generals are my favorites. I don't care for Starcraft but that series is worth mentioning too.

[Spellman]

If you specifically want more Total Annihilation style RTS games, Ashes of the Singularity scratches a similar itch. And of course Planetary Annihilation does TA IN SPACE with the ability to sling asteroids at your opponents. Personally switching to a 3D sphere world broke my brain.

[pdntspa]

I didn't like Ashes of the Singularity, I really don't like the capture point game mode that it seemed to revolve around (though Dawn of War did the same thing and that didn't bother me...)

Planetary Annihilation is cool too but I really didn't like the spherical maps

SupCom really is the sweet spot

[Log_out_]

It actually started out as a ta3dviewer of total annihilation replays

[pdntspa]

Indeed. I think I discovered it while wish searching for a TA where I could get up close with the models.