The following resources may be useful.
GIT Repository
To checkout run:
git clone git://git.imager.perl.org/imager.git
You can also browse the repository via gitweb
This is mirrored on github at https://github.com/tonycoz/imager
Request Tracker
Imager tracks issues through Best Practical's Request Tracker.
Some easy access links:
CPAN Ratings
You can find reviews of Imager here or write one yourself.
If you do write a review, whether for Imager or some other module, please make it constructive - say why.
CPAN testers
CPAN testers test CPAN distributions on various platforms.
CPANTS
CPANTS does static checks of the code and documentation for various "kwalitee" factors.
Unfortunately, CPANTS has been down for a couple of weeks, I don't know why.