Virtual labs are a great tool to try if you have computer access. I love them because:
I've compiled a list of websites that have virtual labs. Many require Flash or Java software, so be sure your computers have it before trying with students. If any of the links are broken or out of date, please leave a blog comment and I will update.
20. Lab Safety Interactive
21. Virtual Biology Labs- labs for ecology, evolution, and cells
22.JavaLab- This site has tons of simulations sorted by topic. It's got some great stuff!
Enjoy! If you know of other sites, please share in the comments!