Just a quick note: within the last week or so I've picked up pdfs of both Pathfinder (the new Paizo alt.D&D3.5) and Trailblazer (a modular "skin" to add on top of D&D3.5 that addresses many of the systemic problems that the game had exhibited over time.) Despite the formating differences (one being a complete game meant to stand alone, and one being a number of patches and fixes that is unusable without your 3.5 PHB) the similar names highlight similar design goals to both systems.
Both are also cheap, at least on pdf: Pathfinder is $10 and Trailblazer is $5. I couldn't tell you (yet) how well they work, and given that they're both significantly large pdf files, I probably won't read them cover to cover. However, I'll report some scattered findings from each other time.
As a guy who has little interest in dropping my 3.5/d20 game for a 4e game, I'm obviously quite interested in fixes to the game, especially ones that are inspired by a similar mindset to my own. For this reason, I anticipate that I'll enjoy the toolkit approach of Trailblazer more than the complete alternate approach of Pathfinder, but at the end of the day, I guess we'll see...
One thing that I'll say is that both books have absolutely great cover art. I included the Pathfinder one as a sample. Can't wait to see a good version of this without markups and titles on it. I wonder if I can find a way to extract it from the pdf?