I also use Photobucket which is a great tool.
I use Photobucket: http://photobucket.com/
Although I'm open to other options as I find it a bit slow.
On the plus side it's free, got lots of space, allows you to keep your photos private yet still link them in forum posts and has basic editing tools.
What do you guy use for source locations for images embedded into an article, I know I could use the gallery feature, but it seems a bit long winded.