Over the past week we've been bringing you some of our favorite applications of all time. And most of them have been free. I love freeware and open source software. In fact, almost every application I run on my Windows, Windows Mobile, and Linux devices didn't cost me a penny. But I decided to do something a bit different for my favorite apps posts. I want to highlight some of the applications that are so good or so useful that I decided to pull out my wallet and pay for them. Some of these apps I can't imagine living without, while others are just extraordinarily useful.

First up: BeyondTV, from Snapstream Media. You can think of BeyondTV as TiVo for your PC. But it's a lot more. It's a personal video recorder that's extraordinarily easy to use, but also quite powerful. It offers a ton of features you won't find in the Windows Media Center software that comes with Windows Vista Home Premium and Windows Vista Ultimate.

Here's how it works. You throw a TV tuner in your computer and install BeyondTV. You can then search for programs by title, keyword, or category or browse a program guide. You can schedule one time recordings, or record every episode or every new episode of a show. BeyondTV will do the rest, including sorting your shows by series.

There are a few things that set BeyondTV apart from similar PC-based PVR software like SageTV and MythTV. For example it has a built-in "showsqueeze" feature that lets you automatically re-encode recordings using DiVX or Windows Media video codecs. You can certainly do this with other applications, but it typically requires a plugin. But probably the main reason I prefer BeyondTV to the alternatives is that it has an intuitive feeling user interface but allows you to dig around in advanced menus if you want to tweak things.

Come September, Zap2it Labs will no longer offer the free TV guide data used by PC-based personal video recording software like MythTV, Media Portal, and GB-PVR.

Well, there's good news and bad news for anyone using those programs. There are at least two groups, CTpvr and Schedules Direct (formerly known as Easy TV Data) planning to pick up where Zap2it leaves off next month. And it looks like they're both pretty close to having their systems in place. That's the good news.

The bad news is that neither group will be able to offer the data for free. Zap2it is owned by Tribune Media Services. That's the same company that will provide information for th new services, but it won't be free. Neither CTpvr and Schedules Direct, and both companies have set prices yet, but both say they'll have to charge customers for the data.

On the one hand, it's not like the data's not worth anything. TiVo charges customers a monthly fee for program guide data. Without that information, your box is a lot less useful. But if you have a PC-based PVR, now you have a a choice to make. Pay for a commercial PVR applications like BeyondTV, SageTV, and Windows Media Center which won't be affected. Or get a free software and pay for the program guide.