Hello. I want to introduce binding from ruby to exiv2 (http:// 
www.exiv2.org)  library.
I know, that there are some other exif manipulation libraries, but  
choice in this situation is good.

Currently, it have abilities to read exif tags and write them back to  
file.

Project is already on rubyforge and possible to install via
gem install ruby-exiv2

Examples of usage currently are only in tests, however, I will fill  
README on request