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This is something i have been thinking about for a long time, because it's a tool I often need.
So, here it is:
Needlog (http://code.google.com/p/needlog/)
Find a needle in a text-file-haystack!
Needlog is a tool that can perform complex search queries on text-files of any size.
Needldog aims to be user-friendly, cross-platform, and blazingly fast.
This is the perfect tool for analyzing huge log-files.