Every month Author AdvenTours organizes a drawing for an Amazon gift card. To enter, you buy one of the ebooks from the sponsors and then email your receipt to Author AdvenTours to enter. You'll also be entered in the 2011 Kindle giveaway, so you actually have two shots at winning.
See complete details and peruse the novels from the sponsors here:
Win a $40 Amazon gift card
Naturally my fantasy novel Union of Renegades is one of the choices. My ongoing promotional giveaway of the ebook through my websites would not count for entering but it's only $1 in the Kindle store.
Other choices are:
Encrypted by Lindsay Buroker - I just interviewed her on Monday
Summer Solstice by Gayle Hayes
Wishful Thinking by K. Crumley - Read her recent guest post about fantasy world building
Piety and Murder by Thomas Drinkard