Photobucket is wicked awesome and here's why:
1. Select the images you want to include in your post by checking the boxes below them (mouse over the image).
2. Go to the bottom of the album page and click this link:
3. Choose which type of code you want, and click in the code area. It will automatically be copied for you.
4. BLAMMO! You can now past in all your images at once.
Also, Photobucket doesn't downsize your images like Flickr does. So when you are posting high-res images (like wallpapers) they will still be the right size.