iTunes obviously has a great deal of data about its sales; Apple is quite aware of the top sellers among its music, apps, movies and podcasts. That information is also available through RSS feeds. If you want to share that data on your website, or even if you just want it in your RSS reader, you can use the official iTunes RSS Generator to get the right feed.

You can refine the RSS feed created by Country, Media Type, Feed Type, Size and whether to allow explicit content. The Media Types available include Music, Podcasts, Audiobooks, TV Shows, Music Videos, Movies, Mac Apps and Apps. There are obviously many options under each media type, so you should check it out and see what's available. Just punch in the criteria you want to follow, hit "Generate" and then hook up that feed to an RSS reader, and you'll be kept up to date on the latest changes in the iTunes stores.

You badly need to share that photo of your cat wearing a pumpkin costume. It’s understandable. You’ve got an iPhone and Internet access, but which app should you use? There’s recently been a mini-boom in social photo sharing applications, so to help you choose, we’ve tested some of the top free social photo sharing apps

Amazon has released Price Check, a free app that allows you to do some comparison shopping. You start by saying the name of your target product, scanning its barcode, typing its name, or snapping a photo. You'll get several results; tap one to see who's offering it with prices and shipping costs listed. Of course, Amazon hopes it has the lowest price, but it doesn't always win.

I tried the app in a local store and found the barcode scanning and voice recognition worked well. I took a picture of some DVDs, and the app figured out what the movie was and offered meaningful price comparisons to other retailers.