{tech}.Ben Buckman.net

I've done some research scouting the terrain for cross-platform mobile development frameworks (to build native apps in iPhone, Android, Blackberry, etc without separate native code for each). This is what I've found so far:

PhoneGap

• open source (MIT/Nitobi collaboration)
• HTML, JS, CSS (?)
• Community
• were issues w/ PhoneGap approval by App Store, but seem to be resolved
• requires separate platform SDKs

• by AppCelerator (closed open-source)
• HTML, JS, CSS
• phonegap vs titanium from n00b eyes

Rhodes/RhoMobile

• Ruby and HTML based
• Building Crossplatform Mobile Apps with the Rhodes Framework - hour-long demo

• C/C++
• open source

• QuickConnect came up in search, unclear what it does
• Sony Ericcson WebSDK (does not appear to support iPhone)

Am I missing any? Could anyone recommend resources, comparisons, tips, etc on any of these?

(Update: I mistakenly wrote that Titanium was closed-source; it's not.)