I would be nice if the logs can be downloaded from files in winbox… fast and easy 
I would sugest using a syslog server or… I use a pice of code that runs on a win32 box called SYSLOGtoODBC which recieves syslog entries and pushes them to an ODBC compliant database server. There you can slice and dice the logs as you see fit.
You can get syslog2ODBC from sourceforge free… You could drop it on a box running the win32 version of mySQL..
Craig