[3.5] Web Enhancements in Book-form?

[Echoes]

So, with every 3.5 sourcebook, it seems that someone from WotC just has to write a few extra paragraphs a month later. These supplements are all available freely on the wizards website, but sadly, they are scattered in the labyrinthine archives with no indication of which ones have pre-written encounter fluff and which ones have the juicy classes, items, and enhancements that really change the game. To complicate the issue even further, sometimes specific segments or even whole supplements are dropped in as new material in a later book, creating a tangled mess for anyone trying to find the new information in the mountain of material.

I was wondering if anyone had a summary of which web enhancements contain "crunch" found nowhere else, and if anyone knew if there has ever been a published compilation of such material?