I saw that my nopCommerce site had a logged search for:
ADw-script AD4-alert(202) ADw-/script AD4-
I\'m a bit curious though what they were try
Yup , they were just checking if your site is vulnerable for XSS.
Read http://www.cgisecurity.com/xss-faq.html
and Rsnakes XSS cheat-sheet
http://ha.ckers.org/xss.html
for more info