Obviously it's not a help if you are not a coder (with loads of spare time) but when I found a bunch of issues with the blogger importer, I set about fixing them.

That was about a year and a half ago, I managed to consolidate a bunch of changes and fixes in 6 months of odd evenings and get the 0.5 version out which was 1 year ago today. The 0.6 version that handles the image has taken a bit longer, but it has been in beta testing for quite a few months now. I've one more key issue to fix with regards to refreshing the screen which I believe is a combination of how the importer stores data and how the Ajax is being handled (both inherited design decisions)

You can read about some of the issues and see the latest code here, if that's any help.

http://core.trac.wordpress.org/ticket/4010

p.s. Yes I appreciate that the Wordpress data files are a lot different but you might be able to get something useful.