[silentbicycle]

Ierusalimschy's LPEG (a PEG parser for Lua[1]) also has some new developments. IIRC, he found a way to greatly improve the space performance of PEGs. I've used it a lot (it's a nice middle ground between REs and a full parsing framework, and Lua is one of my favorite languages), but I'm not familiar enough with Ford's PEG implementation to be more specific.

Also, here's a good blog post[2] in which the author discovered how using parsing tools to syntax-highlight text as it's being modified quickly led him to the frontiers of parsing research.

[1]: http://www.inf.puc-rio.br/~roberto/lpeg/lpeg.html

[2]: http://www.codekana.com/blog/2009/04/02/on-the-speed-of-ligh...