I just had a few suggestions for your otherwise great plugin.
First of all, the time displayed on the Download Monitor log page seems to be in GMT. Shouldn't this be the timezone set in the general blog settings? I could see how the developer might miss that given that he lives in the UK, though.
My other suggestions are related to the stats that the plugin provides. I think they could be more helpful if there was also a page just for stats instead of only dashboard widgets. The "Top Five Downloads" doesn't really change much for me. I think it'd be far more useful to see the top five downloads for a day, week, or month, especially on the dashboard.
Hope you find this helpful.