With Olympics travel heating up this weekend there will be plenty of folks arriving at one of the six London airports. And for those curious about how to best get from the airport into town or between the airports Kerwin McKenzie, a fellow travel junkie, has put together an eBook published for Kindle to help navigate the transit options available. While it is quite reasonably priced in general, Kerwin is giving it away for free through July 28th to help people headed to the games. Even if you’re not headed to London this week, grab a copy. The information is solid and free is always nice.