Two year back I was a Koha (http://www.koha.org) consultant, may be the first Koha consultant from India. I did two successful installations, but later when I got a job I stopped my consultancy works. Actually I got many offers from all over India to install Koha. But I found it will be very difficult to support many clients alone. Though two of my customers was happy. Yesterday (Sunday), I visited one of customer. They required few changes in OPAC. In five hours somehow I completed that work. I was constantly referring perlintro, perlretut etc. I think it will be very difficult for a Python programmer to do Perl programming. I have written a document and scripts for ISIS to Koha migrators: http://www.kohadocs.org/CDS_ISIS_to_Koha.html (ISIS versions are distributed by UNESCO since late 60s. and there lots of installation world wide.) Hmm.. now I will get back to office works, I got lots responses for my Zope3 article, so I will improve it.