PhoneGap in Mashable Article on HTML5 and Cross Platform Dev | February 23rd, 2011
Christina Warren just posted a good high level overview of how HTML5 is addressing cross platform dev for devices.
On PhoneGap:
PhoneGap is an HTML5 app platform that lets developers build native apps using HTML5, CSS3 and JavaScript. What really sets PhoneGap apart is that it lets developers create a full-functioning mobile web app but place that app in a native wrapper, so that it can use native device APIs and get submitted to the App Store or Android Market.
In essence, it enables mobile developers to create an app just as if they were targeting the mobile browser but with the benefit of being able to get into the App Store.
PhoneGap Build is a new service (still in beta) that lets developers quickly and easily create app-store ready versions of their apps for various platforms. It does all the work of compiling the code for various platforms and gives the developer a final build suitable for submission to the app market of their choice.
I don’t really consider Titanium as an HTML5 solution but it does tackle cross platform dev.