Don't ask us, ask your users how you can improve it, while at the same time <i>tracking</i> their usage habits. Analytics + feature requests is a win.<p>The most powerful tool for improving web apps is actually a telephone. Get yourself some headsets and a $10 Skype credit. Should last you a month.<p>Implement the feature and expose it to 10% of them. Watch how they accept it, then push it to the rest. Make a blog post about it and release a PR statement. Let industry publications aware of your existence. Then take a few weeks "off" getting more clients. Then repeat.<p>Try to keep a "how can we improve" button clearly visible, but not distracting. Make yourself reachable. Get a Google Voice number and put it on the opposite side of your logo.<p>Something as "simple" as extending the session timeout for everyday software can make a huge difference. People hate it if they kept getting logged out, specially for non-critical and non-financial applications. Go overboard in building trustworthiness; put the app on SSL, show lock icons, never show them their credit card back (if you're stupid/big enough to take it to begin with.) Any sensitive information should be shown in non-editable GUI elements (labels mostly) and show the last few digits to disambiguate. If you ever charge their accounts, or processes payments for them, send an email confirmation ASAP. Payment confirmations are the least annoying form of email; it shows you're willing to leave a paper trail (irrational, I know, but it gives them the fuzzies.) and it's a good opportunity expose them to your branding/message/identity.<p>If you ever keep a "purse" for users, where they can add and withdraw funds, never EVER send them an email containing their balance figure; some people have email notification widgets that popup a dialog with the subject and first few lines of the body (<i>"$20 Payment Received, you now have $20.15"</i> might seem like benign feedback, but not when your user was on a projector in a meeting. No seriously, people, kill them damn notifiers when you speak publicly. Nothing distracts like seeing a nastygram from your speaker's wife flash across the screen.)