This is the first time that I've submitted anything here, but I lurk and read HN daily. My partner Joe and I just launched a suite of tools for building 2D web games with pure JavaScript and we'd really love your feedback.
http://www.effectgames.com
Briefly: we're a web developer and designer who are both very heavily into video games. While trying to avoid any negativity around Flash, we thought standard and open web tech would be a better basis for creating games (plus we're more familiar with JavaScript).
We have been working on this off and on for over four years, and now we're ready to release the "Effect Engine" -- a pure JavaScript / DHTML framework for displaying and animating game graphics, playing sounds & music, handling keyboard & mouse, and performing sprite collision detection. It smoothly renders multiple layers of parallax scrolling tiles and sprites without requiring Canvas or SVG (so it plays nicely with all modern browsers).
Right now, we're working on expanding some of the available game demos to full blown titles (for example: http://www.effectgames.com/effect/games/crystalgalaxy/1.0b), but that doesn't mean that the engine is done.
We're planning on launching a slew of new features in the coming months, but we've gotten to a point where we'd really appreciate some feedback for improving Effect.
As excited as we are about finally getting to create the games that we've had in our heads for years, we're even more excited to see what our friends on HN can do!
Min and Joe