...What i am thinking is instead of a leader board stating on who mined the most blocks but take a bit further and make it where you can see what YOU have done instead of who leads it. So for example you would search your name and your profile would pop up and it would say like i have walked 43 miles and mined 49 blocks also it would say i have killed 3000 mobs and have been killed 32 times. I realize that there is in game stats but i think this would be more nice and a little more clean looking. ...
Assuming you mean what
craftymatt13 posted where it shows the top 10 and your own personal stats too; then this is actually something we have definitely got planned to do already, and will hopefully be coming with or just after the big update we have planned for the site.
The issue currently (and the reason why it hasn't been released already) is that the statistics shown only update every 2 hours (for everyone as a whole); this would obviously need to be adjusted if personal statistics were to be added because otherwise when you visited the page the top 10 list would be possibly from up to 2 hours ago and yet your personal statistics would be roughly live; this could lead to some possible rank confusion.
We definitely have this planned though yes, and also with statistics on people's profiles. For now though as
Xavier explained you can view many of your statistics from within Minecraft itself (obviously no ranks there though).