A not so well known AJAX library (thanks for the tip Frank) and an interesting web frontend for building generating and embedding google maps:

An interesting AJAX library (of german origin):

• qooxdoo » Home
  qooxdoo is one of the most comprehensive and innovative Open Source (EPL/LGPL) multipurpose AJAX frameworks. It includes support for professional JavaScript development, a state-of-the-art GUI toolkit and high-level client-server communication.
  (tags: software opensource library ajax javascript qooxdoo)

A webfrontend and service for generating and embedding googlemaps

• Atlas – Mapping for Online Publishers
  Simple, free online-mapping * Create a high-quality online map in a few seconds * Embed a map on your page in any size or format * Allow readers to plot comments & photos on maps New! * Download your data in KML format * Map content from Wikipedia and Goo
  (tags: service maps tools googlemaps atlas)