This is the official declaration of existence for the Glitch Helperator - a collection of Glitch related tools and things I've put together. More specifically:
Skill Tree: View an interactive tree of the skills laid out according to their dependencies. Hover or click on a skill to see its dependencies and its dependents.
Achievements: View all achievements grouped and categorized with those you've completed highlighted, and percentage complete per category. Includes hidden achievements not listed in the Glitch encyclopedia or API.
API Update History: A log of changes to achievements, skills, and streets in the Glitch API. For instance, see that the new Giant Lover achievement was added around the 13th. Also subscribe-able as an atom feed.
Favorite Streets: A notebook of your favorite streets. Annotate and add your current location to your list of favorite streets. Select one of your existing favorites to set as your destination.
Find Neartest Feature: Starting on your current street, find the street nearest you containing that for which you're looking.
If you try the Glitch Helperator let me know if you find issues or otherwise have comments. Thanks.
EDIT
I've opened a group Glitch Helperator Quemments & Bugs for reporting bugs, asking questions, and making comments related to Glitch Helperator.