here are some excellent blogs written by some professional quants on excel, Matlab, math and trading strategies that I collected. Hope you like them.
Max Mama on Automated trading
http://www.maxdama.com/
Quantitative trading
http://epchan.blogspot.com/
Finance4traders:
http://finance4traders.blogspot.com/
Trade with Matlab:
http://tradingwithmatlab.blogspot.com/
Andrew's Excel tips:
http://www.andrewsexceltips.net/tips.htm
Wolfram Mathworld:
http://mathworld.wolfram.com/
Max Mama on Automated trading
http://www.maxdama.com/
Quantitative trading
http://epchan.blogspot.com/
Finance4traders:
http://finance4traders.blogspot.com/
Trade with Matlab:
http://tradingwithmatlab.blogspot.com/
Andrew's Excel tips:
http://www.andrewsexceltips.net/tips.htm
Wolfram Mathworld:
http://mathworld.wolfram.com/