Primarily, MyBlogLog Pro gives you real-time stats in order to serve your obsessive-compulsive data needs. If you have lots of traffic then it's helpful to get real-time feedback on your links. If you don't have a lot of traffic, the free version may be sufficient.

Additionally, MyBlogLog Pro gives you a longer list of "top links," listing all of the links clicked on your site each day, which is useful if you have dozens of links. If you don't have a lot of links, the free version's daily Top 10 links is probably fine.

If you're not sure which version is right for you, sign up for the free site. We give all free members a week's worth of free real-time stats in order to make sure that they've got the JavaScript working properly on their web sites. If you find yourself checking your link stats multiple times each day, then the Pro version may be the way to go. If you only check your stats every couple of days, then the free version is probably the ticket for you. Simply, the pro version gives you more robust stats. For instance, on the Reports tab, some of the items that pro users can choose to get reporting on (what readers read and where they came from) are not accessible for free users.