[binarysoul]

shouldn't that be #!/usr/bin/env ruby

[naner]

Using absolute paths is still perfectly acceptable. Wikipedia covers the basic benefits/drawbacks:

http://en.wikipedia.org/wiki/Shebang_%28Unix%29#Portability

[pyre]

For example, Comix uses #!/usr/bin/env python, even when it's installed by the package manager (at least on Ubuntu). This means that if I launch it from a terminal with a virtualenv enabled, then it blows up because chances are that I don't have pygtk on that virtualenv (because I generally don't work on GUI apps). At the very least, things installed by the package manager should point at the interpreter that is under package management.