1) Make a spreadsheet. I used Google Docs, because I like to be able to link my own log. I hope others will do the same because I love to stalk.

Click for larger image.
2) What you want to track is of course how many books you've read and what they were called. That's really the most basic thing. But spreadsheets are pretty wonderful and will do math for you if you tell them to - so why not use that?
3) Highlighted in red is my total page count. An important part of this is to know that you don't have to finish every book you start, thus also the 'A' column made for tracking the books you do finish. To make the spreadsheet count the amount of pages/books/whatevers, enter the code also highlighted in red at the top right. My read pages are in the 'E' column, but for obvious reasons yours might not be. So far, it only counts the numbers listed in cells E2 through to E21. Easy to change later on if I manage to fill those out!
4) The stuff highlighted in purple are fun stats (or not, I don't know how much of a geek you are. Don't judge me) that really serve no purpose (other than the total page count of the books because I want to do things with percentages and pie charts (don't JUDGE ME).