On this tutorial you can see an easy way to design oligos for gene synthesis, or in other words Gene design.
The description is based on the Instructional Videos from the iGEM website!
Gene design in less than 10 minutes!
Good luck!!!
Some usefull tools:
1. Gene design web page
2. Tools at DNA20
3. Tools at DNA Works
4. A Revese-Complement Tool
5. Gene designer a comprehensive tool to artificial gene design from DNA20 described here.