Data source configuration in SSRS 2005 Report Manager 500+ reports

Hi,

I am just looking for the most convenient way for the below scenario:

I have deployed 500+ reports (only RDLs and not data sources) to the SSRS 2005 report manager.

Now coming to the configuring the data sources for this reports (different reports are using different data source) how do I go about creating data sources in the fastest manner?

Please advise.

Thanks