Customer loyalty in the age of Web2.0

Customers have never had it better on the internet. Developers are more and more obsessed with customer satisfaction and in the same time they have the means to learn what users want and they can satisfy these wants nearly immediately. It is all about agile development: moving fast, correcting mistakes and understanding users better with unprecedented speed. The only problem is that while users never had it better developers never had it more difficult to produce loyal users. Users are spoilt kids, just like I am right now. I need a Twitter client (as www.twitter.com is a bit too simple). First I downloaded Seesmic Desktop, built with AIR, but after a couple of weeks I got bored of CPU sucking, so I switched to CoTweet, that runs in the browser and has some nice features e.g. multiple accounts. Today I saw Scott McMullan tweeting his like for the web version of Seesmic and I switched. Then I realized: I'm not loyal to these web apps, but that's no big deal. What matters a lot - to me at least - is that my own customers might not be loyal either. How do I make them loyal in this user spoiling world of Web2.0 and co? Oh, yeah, good old times of customer lock-in ;)