Optimized Ansi C libraries for DSP I am new to DSP? Where is a good resource for open source DSP algorithms? 

MATLAB is great at making protos but once we move to C coding, it takes time and we end up making too many mistakes. I would guess there must be good repositories of C codes for various implementation of filters etc. Any pointers would be good.
The rub is that ANSI C is not a terribly good language for real time DSP. Many features that a real DSP chip has can't be addressed in ANSI C. These include address generators, bit-reverse addressing, circular addressing, SIMD, memory segments, multiple buses, fractional data types, fractional multiply, certain fixed point math, zero overhead looping etc. Hence most compilers for DSPs have an extensive set of language extensions (#pragma, inline assembler, new keywords, etc). However these are decidedly non-ANSI and not portable.

Writing a simple fixed point FIR filter in ANSI C can easily be 10 times less efficient than using the proper extensions or assembly code.