I just talked with a new Adium user trying to add a second AIM account. The experience wasn't positive. It looks like this is what happened:
Preferences -> Accounts -> press the + icon, a window pops up
1. Something is highlighted in the list above, so the menu must apply to what is highlighted, right?
2. Wait, it's a list of account types, I must be changing the account type for the highlighted account?
3. [give up]
4. They circled a bit and then realized what was going on.
Admitting that this is one data point, I do think this is confusing. I suspect there's a simple fix and a "right" fix. The simple fix is to expand the menu titles to be something like "Add an AOL Instant Messenger account", "Add a Jabber account", etc. The "right" fix is to lose the menu and have the + button bring up a dialog box with the options (as how Mail.app does it).
