I had a look. It seems to collect a nice wide set of parameters, but it's not practical to run it continuously.
From the mobile logger site: "Note: This is a battery-intensive application. A 30 minute ride may use 10-15% of the battery (on a 3GS device)."
My ability to use these things is very dependent on them being low overhead - if they interfere with my routine they must provide a big payoff!