Today's list contains quite a few top-notch iPad apps, including the wonderfully entertaining Uzu. We also have a handful of popular iPhone apps that have gone free, like the old school shoot 'em up Roswell Fighter and the arcade racer Kamikaze Race.Roswell Fighter ($.99 -> Free): A top-down arcade shoot 'em up that will take you across 11 action packed levels filled with over 40 different enemies. Blast your way through each level by controlling your plane via touch or accelerometer controls. Pick up power-ups along the way and take part in the mini-games. The game also features three levels of difficulty, boss battles and OpenFeint integration. Roswell Fighter is available for free today only (7/3). It has a three-and-a-half-star rating. My Hours ($1.99 -> Free): Record your upcoming work schedule to the app in order to track your hours. Hours can be tracked by week, month and year, and totaled for each job or place. The app is also able to sync with Google Calendars so you can share your schedule with friends and family, set reminders and merge your work or business schedule with your calendar. My Hours is available for free through the weekend. It has a four-star rating. Kamikaze Race ($1.99 -> Free): A top-down racer where you take control of one of three fast cars and try to survive as long as possible. Avoiding traffic is done by simply tapping the left and right arrows at the bottom of the screen. The game also features OpenFeint integration. Kamikaze Racer is available for free through the weekend. It has a three-and-a-half-star rating. Rocket Downhill Penguin ($.99 -> Free): A distance game where you must tilt and turn your device to get your penguin safely down the hill. Trees and snowmen will take away from your health bar (hot cocoa) when ran into, and if you run out, the game is over. You can replenish your health and earn multipliers by picking up cocoa on your way down the hill. The game also features online leaderboards. Rocket Downhill Penguin is available for free through the weekend. It has a three-star rating. Universal: Flip / Bubble Text ($.99 -> Free): A relatively simple app that allows you to flip text upside down or surround it with bubbles, and then copy it to another app or post it to Facebook or Twitter. Flip / Bubble Text is available for free through the weekend. It has a four-and-a-half-star rating. iPad only: RecipeFinder ($.99 -> Free): Basically a food search engine wrapped in an app that allows you to bookmark your favorites, add ingredients to a shopping, retrieve past recipes that you have browsed, select random recipes when you need inspiration, and share them with your family and friends. RecipeFinder is available for free for an undisclosed amount of time. It has a four-star rating. Uzu ($1.99 - Free): A ridiculously entertaining "particle visualizer." Touch the screen and command the points of light. Twirl, tap, twist, just do as you please. The app features 10 different modes based on the amount of fingers that are touching the screen, so there is no right or wrong way to go about it. The 10 different modes include: 0 Touch: Brownian motion and boundary wrap 1 Touch: emanate and radiate 2 Touch: pinch attraction and boundary bounce 3 Touch: tri-point vortex 4 Touch: quad-point inverted vortex 5 Touch: 3d freeze and translate 6 Touch: 3d oscillating mass 7 Touch: 3d tri-arm spiral 8 Touch: 3d warp and inverted translate 9 Touch: 9 springy space ribbons 10 Touch: change color and particle size Uzu is available for free through the weekend. It has a five-star rating.