I think it's great that you offer a Flickr widget, but many Flickr users are finding it difficult to find the right themes that won't crop Flickr's largest blogging photo size of 500px on a single line.
You may want to put designations on your current themes to denote which ones can handle the large photo size without cropping and work to ensure that additional themes with larger main columns are offered in the future.
Here is an example of the conundrum that we're facing. Frankly, the WordPress photo upload needs some work. I don't like to use it at all.
[Link fixed - drmike]