Stock.XCHNG, a huge gallery of free images, now owned by Getty Images. It provides a useful alternative to other free image sources, such as freeimages.co.uk or pics4learning.com, and subscription services, such as SCRAN. Organised like a paid-for stock photography site, Stock.XCHNG contains over 350,000 images that can be used freely for non-commercial purposes. As with all stock photo sites, there are some fairly mundane photos available alongside some quite striking images - do a search for images of 'London' to see what I mean!
Stupeflix is an interesting alternative to Animoto, in that it can quickly transform a set of images into a video. There are restrictions in the free version which limit its usefulness - no downloads, for example - but, it is very easy to use, has a huge range of music soundtracks (as well as the facility to use your own) and exports directly into YouTube.
Screenr is a brilliant tool for creating short videos of your computer screen and is another tool that works well with YouTube.