As with Fliq for iPhone and Fliq Notes, Fliq Tasks is available in the App Store for free (click opens iTunes). Mark/Space is providing their iPhone applications for free, while charging for the Mac and Windows "host" software. Fliq for Mac and Fliq for Windows are available for US$19.95 (US$49.95 for a 3-pack) each.
If you want to transfer files between iPhones over a Wi-Fi network, all you need are the free iPhone apps. When you add the functionality of transferring information to and from your Mac or PC, you'll have to purchase the desktop applications.
Fliq Tasks is a full-featured task manager with big, clear, and easy-to-use interface similar to that found in Fliq Notes. Tasks can be listed by name, date due, category, and priority. You can add categories to better match them to your requirements, and there's a simple setting to hide completed tasks. Using the soon-to-be-released Fliq 1.1 for Mac or Windows, you'll be able to send or receive tasks from your iPhone to your big computer.
Current Fliq users should be sure to give Fliq Tasks a try, and the price is definitely right. Check out the mini-gallery below for more screenshots.