I don't know how many of these have already been said, or how many Jay is already working on, but (all for forums):
- Formatting-bold, italic, underline
- Uploading Pictures
- Inserting Picture & Video links (by inserting links
- Viewing formatting, pictures and videos as they would appear on the website (quotes are always at the top in the app even though they could be written as {top-to-bottom} quote, text, quote).
- I don't know if this is possible, but having videos play in the app instead of going to YouTube.
- I don't know if this is just a WP7.8 thing, but on my 900, whenever I touch "images" and the link shows up in the post as something like "forums.wpcentral.com/attachment", I am not ever able to view those in-app and always have to tap where I would be seeing the picture to see it in IE. However, after I do this, I get taken to WPCentral.com and get promoted to log in (if I am not already) or register for an account, even though i can view the image without being logged in and going to the forum link in IE.
I can clarify that last suggestion if I need to.