Mecha galore.

Gundam

The series in chronological order:

Mobile Suit Gundam

Gundam 0079: 08th MS Team

Gundam 0080: War In The Pocket

Gundam 0083: Stardust Memories

Gundam 0087: Zeta

Gundam 0088: Double Zeta

Gundam 0093: Char's Counterattack

Gundam 0123: Formula 91

Gundam 0153: V Gundam

And the alternate-universe series:

Mobile Fighter Gundam G

New Mobile War Chronicle Gundam Wing

After War: Gundam X

Turn A Gundam NEW!

SD Gundam

Availability:
Gundam is currently being released through AnimeVillage.com. Only the Gundam Movies 1, 2 & 3, Stardust Memories and War in the Pocket have been released so far; depending on sales, the rest of the series will follow. Gundam Wing is now playing on the Cartoon Channel in the US and on YTV in Canada; check EX Magazine for more info.

The Gundam Project your one stop Gundam shop

The Mecha Domain all the specs for every mech in every series, yeehaw!

Gundam Silhouette a conversion of the Silhouette RPG system (Heavy Gear, Jovian Chronicles) for Gundam. very cool.

FTP Archive of Gundam Pics pretty self explanatory.