DemConWatch - Best source for superdelegate endorsement info.
USAToday Election Central - Probably the best resource for votes. Pledged PL/EOs and At-Large delegates are shown at the bottom.
WashingtonPost.com - Adobe Acrobat document with full listing of superdelegates broken out by state and then type.
CapitalEye - Lists campaign contributions in last cycle.
PoliticalIndex.com - State political party links (the Washington Post link above should give complete information. However, if you need to follow up, try these links.
Politico.com - politico.com's page showing superdelegate status. If you click on the '+' icon for any state/territory, the list will expand and show the commitments. WARNING - This should not be considered a valid source for updating the table. It is however useful as a reference for finding source material. For instance, you can use a Google's news search to confirm a superdelegate's status as it is shown on politico.com.