Userfly is a pretty cool service. It records what people are doing on a website. usabilitypost has a review, writing:

Seeing how users browse your site is eye opening. People might say one thing about the site, but they may actually be doing something else entirely. A lot of browsing decisions happen at a sub-conscious levels, so seeing people actually browse your site rather than asking them questions about it is the only way of getting an accurate picture of what people are doing and what parts of the site are confusing to them.

Worth a look, although the userfly js file seems to clash with some versions of jQuery, so make sure your site still works after including it.

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designed for use cover

But wait, there's more!

Want to read more like this? Buy my book's second edition! Designed for Use: Create Usable Interfaces for Applications and the Web is now available DRM-free directly from The Pragmatic Programmers. Or you can get it on Amazon, where it's also available in Chinese and Japanese.