All the foul locales books are great. I recommend them for ideas and inspiration, though you will definately need to tweak for 3.5

If you're looking for a list book detailing NPCs and their store/tavern/whatever, you'll find this product a worth while purchase. If you are looking for a book with a bunch of city adventures, you might find this product a worthy purchase. If you are looking for side adventures hile in the middle of your on-going campaign to throw your players a loop, then you will find this product a very good buy! There are plenty of information about NPCs and some new prestige classes, but the product on the whole is more like a series of unconnected mini-ventures that make a good change of pace to break up the monotony of constant dungeon crawls or wilderness encounters. You could have your players encounter these as an ocurring event just to show them that they are not the center of the universe they believe they are. Also, the key codes are a very nice aid to show just where the best location for the adventure should be.