I run GoBackpacking.com and due to a recent redesign of the site, I now have several openings for 125 x 125 button ads in the right sidebar. My PR2 travel blog currently receives 12,000 visits/month, with 24,000 page views and 780+ subscribers. Traffic has grown over 20% in the last 30 days (thanks to leveraging a new audience via Twitter). I'm asking $50 per month, paid via PayPal. Discounts for 6-12 month commitments. Please private message me if interested.