Already this week, we brought you guides to the best , and apps in the iOS universe. And we saw that keeping your travel costs low will be all the rage this summer, with updates to the and apps that help users find the cheapest gasoline prices in their vicinity. Also noteworthy: An update to the that lets friends and family track you when you go for a jog.

Other new and updated apps that caught our eye this week:

: If you've wanted to travel the road with the navigation app, but balked at its $29 asking price, developer ALK Technologies has an alternative for you: The free app for iPhone and iPad offers 2D maps that can be stored on your device for offline use; it also offers you up to three different routes to choose when trip-planning, and includes the ability to post your travel plans to Facebook and Twitter. Not everything is free, however: If you want features like voice-guided instructions, 3D maps, or speed limit warnings, you'll have to pay for in-app upgrades. The developers warn, however, that you'll probably want to use the 3G- and 4G-enabled iPads if you use the app on a tablet: You can use the Wi-Fi-only iPads, but you won't get the GPS guidance.

: Our favorite apps aren't just good--many of them are constantly being improved. So it goes with , the free productivity app for iPhone and iPad. The app already lets you save articles, jot down notes, record voice reminders, and keep pictures in a permanent personal archive. This week's update includes a host of upgrades to those features, including an upgrade to "more powerful" note-editing tools, added support for your iOS device's Photo Stream images, and a redesigned audio recorder. Users also gain more control over their information in this upgrade, including the ability to turn off the app's automatic "save to Camera Roll" function.

: This was already one of the most-popular iPhone podcatchers around. But Vemedio's $1 iPhone app underwent big changes to its user interface this week, adding an AirPlay button and a sleep timer, the ability to share your podcast's playback position via email and Twitter, the power to pause and cancel downloads, and the ability to re-order your podcast downloads according to your priorities. The app's price has also been reduced from $2--though you can spend $2 for an in-app upgrade to Instacast Pro, which offers users the ability to manage playlists, adjust playback settings on a podcast-by-podcast basis, and receive push notifications of new episodes.