I've been a fan of Creative Mountain Games ever since Mark put out the 3.5E SRD. This has turned into my SRD bible, if you will.

Creative Mountain Game's latest is 30 Things Can Happen! It's an assortment of random tables to add flavor to your adventures as they are happening. They add the little things that bring life and spontaneity to the world your party is adventuring in.

You get 30 tables broken down by category: While in a City, While in the Country and While Underground. Each table is further broken down by thirds. So, depending on how you look at it, you have 30 tables with 30 entries each, or you have 90 subtables with 10 entires each. Priced at $4.50, you are effectively paying 15 cents a table (or 5 cents a subtable). A fair price in my humble opinion.

This will be one of my go-to resources in my upcoming sandbox style campaign.