You can integrate information from many different external systems in your SharePoint 2010 sites using Presto mashups as external content lists. If information of interest comes from a Presto mashable, simply wrap the results in a compatible mashup in Presto.

Presto makes it simple to connect to many different types of information sources in your organization including databases, web services (using WSDLs or REST), web feeds (using RSS or Atom), CSV or XML. You can expose this data and integrate it in your SharePoint sites using Presto mashups and SharePoint external content lists.

Consider the Requirements and Limitations and then follow The Mashup-to-External-List Process to get started.