Second try: livejournal has a whitelist for email/mms posting and Jesse's number isn't on it.
Third try: stupid cingular to att transition changed our outgoing email addresses. No wonder my phone posts haven't been working recently either.
Fourth try: D'oh, .net not .com. This is getting really annoying.
[Edit: Wow, it finally worked. Clearly I am not careful and meticulous enough to get it right on the first try... and clearly I didn't think about fixing posting on my phone first, which would have been cheaper since I have a different data plan. Stupid phones. I really like the Treo keyboard. The iPhone is pretty, but expensive.]