"...And we don't need any magical require statements to use them!...Rip requires no changes to your code, only an optional deps.rip file added to the root of your project. As a result you do not force Rip on anyone else and individuals are free to re-package your code using other systems...Currently it's UNIX-only."
It does sound interesting, I was hoping that it would be a full fledged alternative to Rubygems, because as good as Rubygems is, you do come into all kinds of issues with it: using behind proxy servers and making gems portable for using in apps (that damn 'require' statement) are two I can think of.
Alas, it seems the goals of RIP are slightly different from Ruby Gems. But definitely one to watch.