have you checked out the Wiki? There is a lot of topics there. It is still getting sorted out and what not so you may need to use the search engine to find specifics more times then not.
We have some images that are pre-built OpenStack builds. The latest is from a couple of weeks ago for the upcoming OpenStack IceHouse release.
ODL and Icehouse Integration
All in all it is still rough around the edges and has a ton of development happening still.
There are some basic mininet examples using OpenFlow and the OVSDB plugin here:
OpenFlow and Mininet
OVSDB ODL plugin:
ODL and OVSDB Plugin with Mininet
For API related apps, Fred Hsu's blog while a bit dated now has some great examples:
OpenDaylight Api App usage
If you have any other specific interests the IRC channel is a good place to interact at irc.freenode.net #opendaylight or ping us in #opendaylight-ovsdb
Cheers,