The most recent June/July 2012 Mother Earth News has a whole article on plants that keep mosquitoes away, they recommend:
Lantana (Lantana camara)
Rose sented Monarda (bee balm)
Lime basil (Ocimum americanum or "hairy basil")
Catnip (Nepeta cataria)
Sacres basil (Ocimum sanctum or "holy basil")
Thyme (Thymus vulgaris)
Lantana (Lantana camara)
Rose sented Monarda (bee balm)
Lime basil (Ocimum americanum or "hairy basil")
Catnip (Nepeta cataria)
Sacres basil (Ocimum sanctum or "holy basil")
Thyme (Thymus vulgaris)