I've been busy uploading photos from our recent 5-week vacation and the more I work with Flickr, the more indispensable it becomes. If the net term, mashing-up, means "to tie together web data from different sources", then this blog and Flickr are a mash made in heaven. I can now point you off to a Flickr page to show you most anything.
I can even directly embed a photo without having to make a copy for my server. For example, here's last month's photo of Jinka the cat asking auntie for a handout. It's running on Flickr but loads when this page does. Cool, eh?