Last time I checked the TclCurl author was looking for somebody to help with aolserver integration. If I had more time, I would do it, but I already have enough half finished projects laying around, so I'm not going to attempt to take it on. Integrating TclCurl with aolserver would be a nice project for someone to take on, and it would be something that would benefit the whole community. LibCurl is probably not thread-safe, so it would be necessary to protect it with mutexes. Still, I think it would be pretty straightforward.
I don't think the time to retreive something vs. the exec time is really an issue. If you have multiple users using the exec, it's going to eat your servers resources regardless of how long it takes to retreive something.
