XP is a points system for stuff you do on Listia (currently in beta testing). This can range from simple things like checking in to the site to more substantial things like listing auctions. Your user level is determined by the amount of experience points you have. The XP bar in 'My Listia' shows the total number of experience points you have in the middle and on the right hand side is your current level. The meter displays how much more XP you need to get to the next level. Some actions that give you XP have limits on the amount of times you can do them each day. Have fun with it! We will be rewarding users with high XP and levels in the near future. In the meantime, start leveling up!