You can never have too much Dropbox space, and now for a special beta period you can grab some additional free space while Dropbox is testing their automatic photo and video uploading feature. In exchange for trying their experimental build, you can get up to 4.5GB of extra space for free.
Experimental Dropbox build 1.3.12 imports photos and videos automatically from cameras, phones, and SD cards and batch uploads and downloads files. The forum post on Dropbox says:
During this beta period, we are also offering additional free space to test automatic uploading of photos and videos. For every 500MB of photos and videos automatically uploaded, you'll receive another 500MB space bonus, up to 4.5GB total.
The downloads for Windows and Mac are only available from the forum post. Note that you're also strongly advised to make a backup of what's in your Dropbox before upgrading to this build (emphasis on the "experimental" wording). When I installed the client, the software automatically detected my SD card and started uploading the photos, which it put into a new "Camera Uploads" folder and my account had the extra 500MB automatically added. Sweet. Now to find some more photos and videos to add...
If you're looking for even more ways to increase your Dropbox storage capacity, there's always our cheapskate's guide to getting free Dropbox space and the Google AdWords method.
Update: It looks like the import feature doesn't work on Linux or Mac 10.4. On Windows, you'll need to have Autoplay enabled for the feature to work.