FYI: there is a new post on XDA referencing a "new CWM" that you apparently "need" in order to flash the Froyo DL30 ROM. However, it appears from posts on this thread people are successfully flashing with old CWM.
XDA Post:
HOW TO: Install DL30 (aka Froyo) - xda-developers
Post has DL30 file, new CWM file and instructions for flashing.
Quote from post re: new CWM:
Still downloading DL30 (what the hell, i'll be bloated again - feedback seems purty positive so far) so I haven't used this new CWM yet. Will try later and post results here.