Detecting sequence of at least 3 sequential numbers from a given list

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I have a list of numbers e.g. 21,4,7,9,12,22,17,8,2,20,23

I want to be able to pick out sequences of sequential numbers (minimum 3 items in length), so from the example above it would be 7,8,9 and 20,21,22,23.

I have played around with a few ugly sprawling functions but I am wondering if there is a neat LINQ-ish way to do it.

Any suggestions?

UPDATE:

Many thanks for all the responses, much appriciated. Im am currently having a play with them all to see which would best integrate into our project.

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