I had a quick peak and the site looks great. There are a lot of activities there and I only looked at a few. I'll try to give it a more indepth look through when I have a chance.
I looked at one of the wordsearches and they seem nice. I ran across a useful script you might like for your students. You would just need to give them a word list and they could make there own wordsearch to play on-line.
http://www.mes-english.com/worksheet...wordsearch.htm
I have some interactive FLASH games
www.marks-english-school.com/games.html I've also played around with some HotPotato scripts and mixed them with FLASH to make some 'talking' java quizes
http://www.marks-english-school.com/...atricks_01.htm
HospitalEnglish.com has a few interactive things but I just haven't had the time to multiply them out
www.hospitalenglish.com/students/asthma.php
What has been your response from students? Do they continue with your on-line activities or fade out ounce the magic wears off?