Kismet has significant issues on the third release firmware for the N800 due to issues with the closed source driver. The developer has complained in depth on the Maemo Developer mailing list. I sincerely hope that Nokia fixes this issue in the next firmware release. This is a prime example of how the "half open" nature of the N800 is causing problems and stifling the efforts and enthusiasm of many developers and small businesses who would like to use the N800 for "serious stuff"