DaddyGame went out of business in late 2007; their old review remains unaltered here for posterity.
Daddygame is a professional rental service with a good-looking site, fast turnaround and a commitment to customer satisfaction.
They cater to all of the major consoles including GBA and the Nintendo DS though the range of titles for these is a little limited. If you specifically wish to rent for these consoles take a look at their catalogue first - you may wish to consider one of the other companies. The site is easy to navigate and allows browsing by console or by a range of genres.
Turnaround times seem to be quite good, and customer service is adequate though we would prefer to see a phone number rather than just an online form/email address.
Prices: Daddy Game offer three membership programs of one, two and three games-at-a-time rentals for industry standard prices of 9.99, 14.99 and 19.99 respectively. Their free trial is a little on the short side at ten days, but we think they're worth giving a go!