You need a tool to encrypt some files, folders or partitions on your machine? You want it for free and you want to review the source code? Try TrueCrypt, it's really cool!
Do you know that IIS 6 recycles Application Pools every 29 Hours by default? If not, watch out 😉
PS: In IIS 5, the worker process will run forever (unless you kill the process, do an iisrest or anything like that).