For those using Google Analytics to track and monitor traffic on your sites, you may have upgraded the legacy code (urchin.js) to the new tracking code (ga.js). If you have done that, chances are the sites implementing those javascript code will fail the W3C XHTML 1.0 strict compliance.
Apparently the dynamically generated javascript to embed the ga.js javascript file causes a nesting problem. Thankfully, the Google Analytics Google Group forum posted an updated code that would fix this glitch.
If you have yet to migrate over to the new tracking code, do consider. According to this source, the new code brings about smaller file size, an object-oriented implementation, HTTPS automatic detection and more tracking features.