*Macworld:*
> First, you can click the link, wait for your web browser to start loading the file, click in the location bar, hold down the Option key, and then press Return. The file will download.
> Alternatively you can append ?dl=1 to the end of the link, so http://dl.dropbox.com/u/1234567/test.mov?dl=1. This will force your browser to download rather than preview the file.
Good tips to file away.