You can also find them at Hongfire. Hongfire
At Hongfire, the torrent they have for Gundam Seed is split into two:
First torrent: Gundam Seed episodes 1-25
Second torrent: Gundam Seed episodes 25-50

Its something along those lines so if your looking for that kind of torrent for Gundam Seed, go for Hongfire. If you want to download it all at once, then go with Boxtorrents.