I use Flickr. You upload them onto your page and then copy and paste them here. The CSBB photo loader is a good one and handy but photos have to be a file below 100kb memory. I can easily see the difference on my screen between the two.

The Flickr photos can be higher resolution and still full screen sized. If I have a good photo, I post it on Flickr and copy and paste for posting here. You can also paste as many photos as you want in a CSBB post if they're hosted elsewhere.