The Club Log expedition service is free, and obviously it generates plenty of interest - big expeditions attract hundreds of thousands of visitors. This is beneficial to me as I am keen to see Club Log grow. You are probably already spending a lot of money on your trip, so please consider Club Log as a free gift from me to support you! However, if you'd like to promote Club Log then here is the logo graphics pack (containing sources suitable for use on your web site or QSLs):
As Club Log is now fairly large it does require some significant equipment to function, so if you wish to make a donation I would be very grateful. I put donations towards the upkeep of the hardware and networks, and appreciate every bit of help, small or large.
The other thing you can do is mention Club Log in your expedition writeups and articles later. Thanks!