I have the iBlue and I'm looking at getting one of these to mount my X51v for car use:
http://www.buygpsnow.com/oncourse-po...x51-v-720.aspx
It plugs into your cigarette lighter to charge both your Axim and iBlue at the same time. It also has a built in speaker.
I havn't purchased GPS software yet. Right now I'm using my X51v and iBlue with some PPC data logging software we use in our race car.