I have been working as a web dev with C#, VB and PHP (now learning python)..
I have been considering learning C (as a right of passage) because i hate feeling stupid =P
Apart from making me a better programmer in general..
Is there any particualr use to C for a Web Dev in 2010?
Thanks,
Daniel
Given that you have experience of object orientated programming in C#, I would recommend learning C++ as opposed to C. It will indeed make you a more rounded programmer. While you could program web sites using C or C++, it's not commonly done for small scale web sites. Facebook created HipHop for PHP for instance to improve performance:

HipHop programmatically transforms your PHP source code into highly optimized C++ and then uses g++ to compile it.

Good luck with your learning, never stop :-)
Is there any merit to a web developer learning C?