Kamuiweb.com has posted a list of the names for all 22 episodes of season 1 of The Clone Wars. I won't post the list here for those of you who would consider the list a big SPOILER, but you can click here to check it out. Not sure what the source is as the rest of the text is in French, which is why this falls into the rumor category until it's officially confirmed.
UPDATE: Dalsk, who provided the above link, sent over the following as to his sources:
"I was surfing on Wookieepedia last night and I saw the title rumors for (episodes 20-22). So I've seached for more information on the Internet, and I've found the list on the following chinese website : http://www.joysf.com/ " (It's been pointed out that the site is actually a Korean site)
Jovial Jay also chimed in that a number of the episodes, including 20-22, were mentioned on the DVD special features of TCW film.