Fastest way to get data from Multiple lists across multiple site collections

I need to get data from multiple lists which spread across 20 site collections and need to show it as list view.
I have searched on internet about this and got some info like options would be to use search core APIs or BCS . I can't use search because I want real time data. Not sure of any other ways.
if anybody can provide ideas it would be help.

Might LINQ be an option for you?  Using
LINQPad and the
SharePoint Connector, you should be able to write a query that'll retrieve this data, from which you can tabulate it.  I'm not sure how you'd be able to automate this any further so that it's then imported in as list.
For something more specific, I used a third party tool called the
Lightning Tools Lightning Conductor, which is essence a powerful content roll-up tool.  In one of my solutions, I created a calculated column that gave an order / ranking on each item, so that when lists were combined, they'd still have some form of
order.  The web part is also fairly customisable and has always proven a useful tool.
Hope that helps.
Steven Andrews
SharePoint Business Analyst: LiveNation Entertainment
Twitter: Follow @backpackerd00d
My Wiki Articles:
CodePlex Corner Series
Please remember to mark your question as "answered" if this solves (or helps) your problem.

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