Flickr Schedulr lets you create an automated queue of uploads to Flickr
One of the oldest rules of Flickr is not to flood your stream with new images. If you upload five photos, you automatically bump four photos from the top of your stream, most-visible spot. It's like publishing five blog posts, or spamming a bunch of tweets! Your contacts have also probably enabled the 'show only one photo' option, so if they're browsing recent uploads, they'll only see one photo anyway. It's much better to upload one photo each day, for five days -- and that's where Flickr Schedulr comes in!
With Schedulr, you create upload batches, and then decide on when and how often you want images to be uploaded -- but one a day is the default, for good reason.
Flickr Scheduler lets you sit down, set up some uploads for a week or month or year in advance -- and that's it. It lets you get back to the real problem at hand: taking good photos.
[If anyone knows of a Mac Flickr uploader with scheduling, please leave a comment!]