I’ve been having a look at the Flare actionscript library for creating interactive visualisations and the like. Interestingly they’ve packaged in a Tweener like tweening library and a physics library too. Considering I’ve been using Tweener loads and I’ve been looking at APE a bit recently too I wonder whether this would be a good replacement for both or is a bit limited to what they’ve wanted to achieve within Flare. There's an excellent demo and API documentation. I'm mostly interested in the ForceDirecedLayout but being in alpha at the moment it seems that they haven't got round to examples and tutorials for that aspect. One to watch though I think.