At long last, I have enabled the posting of attachments directly to forum posts. You no longer have to upload the files to your own server or to some place like imageshack.us and then manually type in the links. Now when you're writing a post, there will be a button labeled "Add an Attachment". Just click that button and start adding your attachments!
Right now, the only rules in place are:
1. 5 meg file limit
2. Image formats only - jpg, gif, etc.
Even though the file limit is 5megs, please don't feel like you have to post images that big.

Images that are 1024x768 are perfect for large viewing. When you post a large image, a 400-pixel thumbnail of that image will be automatically created.
So give the image posting a try and post some feedback here if you see anything you would like changed.