Detailed route planning can be done easier on almost any Satnav using TYRE.
TomToms don’t log and as there is no longer an SDK only those with older software can reliably run third party logging software.
To be honest, for logging get a smartphone and run some free logging software like MyTrips
Edit - Just spotted this - http://schiralli.wordpress.com/2008/09/08/turn-your-tom-tom-gps-into-a-data-logger-tracking-device/
Never tried it though.