Greed 2: Quick fix
A few people have been getting the dreaded "invalid token" error over the past day or so, so I pushed an update just now.
I added the "Clear Tokens" item in the main menu specifically for this problem. Trouble is, even though it cleared the tokens, it didn't actually log out of of Google Reader, so the only way to refresh the login was to exit the app. Oops! That's fixed now.
Also, unread counts are updated more aggressively, so they're more accurate as you read articles.
I also made a change to the background so "edit tag" tokens are re-used as long as possible, eliminating 50% of the web traffic related to read/write operations. So it's faster, basically.
Notifications should also be working now, informing you of new feeds on the interval you specify in the preferences.