I feel somewhat obligated to reply because I originally tweeted this (and with a title similar to the above).
I didn't do this to kick the guy while he's down. It's that on Twitter I knew enough people working in various roles in startups and even just most companies that I thought this would be a good warning to all of them of what never to do. You don't ever publicly accuse your competitor of outright ripping off your idea (if that really was the case, take them to court, but it's clearly not appropriate here). You don't publicly attack your co-founder because it didn't work out for whatever reason. You especially don't do either one in an email to a group of pretty tech-savvy and possibly well-connected people and then go on to attack said group when they don't respond favorably because oh noes, they're being unfair to you. All because you wanted to tell them about your new startup.
Pratt seems to want to get more connections and more interested eyes looking at his new project for funding and development and more, and he's not helping his case by acting the way he does. All this bad press could have been prevented if he had edited out most of his original email. It should have been something like "Hey, remember me, we might have met before at a previous BarCampLA...I was one of the guys behind Fundable. I'm now working on a new startup called PDXCell, and I'd appreciate it if you'd check it out!". Not this burning-all-bridges tactic. I tend not to talk much at BarCampLA events, but I've still met people there looking to fund startups, talented developers/engineers/hackers, marketing types, and more. That's a lot of potentially useful connections that will now remember this guy as someone never to work with.
So while some of the comments here might really be kicking the guy while he is down, I saw this link as an educational moment, especially to HNers that might someday (if not already) find themselves tempted to do the same. I'd hope Pratt realizes what he's doing wrong eventually..