I've been musing for a while on some of my thoughts on the 'one photo a day' project that I've been taking part in since 1st January 2008. Here are some tips you may find useful.
With ImageCodr.org, there is no need to do image attributions manually, you simply enter in the URL of the picture page (as seen in your browser) you are interested in and ImageCodr.org will generate the ready to use HTML code. It will also display a brief and easy license summary, so you don't get in legal trouble because you missed something.
Wylio is a little different from the other CC image portals. It's also perfect for bloggers and web publishers of all ages. It not only finds cool copyright-friendly images from Flickr's CC pool, it emphasizes a respect for intellectual property.
Kind of like a dictionary but with example sentences, pronunciations and even thumbnails of flickr images tagged with the particular word you're looking for.