This is a nifty little application which is written in the Processing language, which allows you to draw stick figures and export them to Blender for animation.

http://screamyguy.net/sketchBoard/index.htm

There is an interesting talk on Papervision at the Blender conference:

http://river-valley.tv/conferences/blender_conference_2008/

Finally there is a way to get 3D into Flash, from Blender (or another program such as 3DsMax), with Animation! It's a tool called Cast3D.

Check out this:

http://www.rustpunk.co.za/blog/?p=10

You can download the Papervision 3D component for Flash CS3 from here:
http://code.google.com/p/papervision3d/downloads/list

I thought this was a very cool demonstration of the fluid capabilities of Blender. It shows a "magician" character, who "magically" conjures the water into different shapes:

Here are some more Blender and Flash tutorials that you can get for free:

http://www.cartoonsmart.com/demo_index.html

I recently saw a recommendation for some free backup tools for Windows, and I thought I'd pass them along. The following can be useful in different circumstances, over the regular Windows backup:

For full drive backups:
DriveImage XML Backup Software

These technologies are still in development, but here are some incredible developments that can convert a picture into a 3D image:

http://www.photo-to-3d.com/

http://make3d.stanford.edu/

http://code.google.com/p/libmv/

Some links to free 3D models, that are compatible (.blend file, or can be imported) with Blender:

The Official Blender Model Repository
http://e2-productions.com/repository/index.php

Blender Architecture related 3D models:
http://blender-archi.tuxfamily.org/Models 
http://resources.blogscopia.com/index_en.html

I found another tutorial that shows you how to go from a 3D object in Blender, and export it as something that you can use with a Papervision or another Flash 3D engine. It exports to a Collada file, before you import into Papervision.

I came accross this open source 2D annimation tool called Synfig. It's still in beta phase, but it looks to be pretty interesting. One of the things it's supposed to be really good at is tweening. It's intended more for Film and TV type annimations, rather than typical net stuff. I'm not sure if it's going to be as good as After Effects or Flash for most things, but it could prove useful for something!