You can mass upload with the photobucket app. The only thing you cannot do on the app that you can do on the site, is edit images - this is because they use flash for their online live image editor. Obviously you won't be able to do this on the iPad using the actual site either, because iPad doesn't use flash. (you would think, that a big company like photobucket, would use more up to date & more reliable software than flash)
On the android, you can upload lots of photos at the same time, then you press on each individual one to get the links to put them on the forums or sites you want to post the pictures to.
With the app, make sure you go into the settings and decide which folder on your photobucket account you want to send your images to by default, if you constantly change where you want to send them, you have to constantly go into the settings and update the "upload folder".
on android it's:
photobucket app/settings/upload options/choose the default album for uploads (on android it's the 4th option down)
On android, to get to the folder you have chosen to upload the photos to, you need to press on the "my albums" tab across the top, then on my android phone you press on "menu" and it gives you the list of the albums that you have. Not sure how it would work on the iPad, you'll just have to have a fiddle
photobucket app/settings/upload options/choose the default album for uploads (on android it's the 4th option down)
You can also change "default title" to something that you use especially for uploading from your iPad (Like "Uploaded on my iPad" for instance) it will give ALL of your uploads from your iPad this title, so think carefully what you want to put, unless you change it for each batch of photos (ie it's no good calling it the name of your dragon, and then uploading cat photos - it would give them the name of the dragon too :lol: )
Then you can also change "default description" too, obviously you would put whatever you want.
Hope this helps a little.