I was thinking _underscores. e.g.

com.4sightlacking.utils
becomes
com._4sightlacking.utils

Did a bit of digging and this seems to be inline with Sun's approach:

http://java.sun.com/docs/books/jls/s...kages.doc.html - see 7.7 at the very bottom.

I couldn't find much else to support this though so would still appreciate a second opinion. Thanks.