Their website contains extensive detail on the APIs you can you to utilize the native resources and has coding examples of each API.
PhoneGap website link: http://phonegap.com/
Discussion on different frameworks and view points on PhoneGap:
For developers on eclipse framework use this plugin to build PhoneGap apps.
Using jQuery Mobile on phonegap
jQueryMobile general detail on the framework itself
Details of Raven DB will be posted soon.
you can refer to their official site until we post detail links – http://ravendb.net/