Might also check out the blog of Pete Gostelow, on The Big Africa Cycle, at http://www.thebigafricacycle.com/. He just cycled from the UK to Cape Town over 3 years, through west Africa, across the Congo to East Africa and down. He had some great things to say about cycling in Rwanda - he was in both Uganda and Rwanda, if I remember correctly. I'm sure if you emailed him he'd be happy to share info as well, seems like a really friendly guy. Maybe give him a congrats, he just arrived in Cape Town days ago after a crazy 3 years.