Flickr dates

[armb]

http://www.h4ppy.com/blog/2006/03/flickr-tool-for-h4ppier-photos.html will (among other things), let you set Flickr upload dates to match "photo taken" dates on a lot of photos at once, allowing you to reorder your photostream if (for example) you want to stick a load of summer holiday photos back in time months later. It does mean giving access to your Flickr account to a complete stranger, and learning to use Flickr's API myself might be better, but it's a lot easier to use an existing form than fiddling one at a time in Flickr. At least it will in future be now I've found the tool.
And http://www.exifer.friedemann.info/ can set date taken metadata on images that are missing it (or correct it if your camera date was set wrongly).