There are a few things that are fairly obvious, so I thought I'd just do a post collecting some of these:
- Mouse gestures: Very obvious. They are already there.
- Only load plugins on demand: Already available in the settings.
- Being able to store multiple logins for web sites: Start typing the username, and you can choose it from a dropdown and it will fill in the password for you.
- E-mail client which handles tons of mail: It's been moved to a separate application, but it's still available.
- RSS/feed reader: Part of the new separate Opera Mail e-mail client.
- Shift+click to close a tab: Already works.
- USB/portable installer: Available as an option in the installer.
Remember, this is a list that applies to my personal usage. Some may really, really not like the separate e-mail client, for example, but I am covering my own usage here.