I forked the cl-web-utils and oauth2 libraries and started work on a Twilio API.
You can check out the whole project here: https://gitorious.org/om-web-pack
As a change of pace I'm using LispWorks Personal Edition in Windows 7 (64-bit). I've already encountered a compilation error in cl-web-utils. It has to do with the helpers file which has some useful macros and functions, however most of them don't seem to be used and I feel like some of them can be inlined or replaced with functions from Alexandria or another library. We'll see what happens with that.
The changes I'm making to oauth2 are mostly improving the examples and documentation and testing it with a few more APIs like Twilio.