DSP Development Tools On The Web

I'm working on yet another article, and as usual I'm asking the 
community for help.  This is a departure for me in that I'm planning on 
reviewing web-based resources for DSP optimization and profiling -- yet 
I'm not a big one for using anything other than first principals plus a 
math package like SciLab.

I know I've seen suggestions for filter packages and other things fly by 
-- what do _you_ use, and how do you like it?

Thanks in advance.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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"Applied Control Theory for Embedded Systems" came out in April.
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