One of the highly recommended applications on Android is ShopSavvy. Apparently this lets you use the phone's camera to scan barcodes of products, and then tells you the best prices to buy them, both locally and on the 'Net.
Sounds good, but doesn't work on my Pulse :-(
However, the excellent Paul at MoDaCo has produced a custom rom based on the French U8230 version of this phone, which fixes the problem. (For those not wishing to root their phone, ShopSavvy have been told by the phone manufacturer that a new ROM image has been supplied to T-Mobile, so just wait patiently!)
So I'm loading it now - for full instructions see http://trumphurst.blogspot.com/2009/12/rooting-android-on-t-mobile-pulse.html - but use http://www.romraid.com/paul/pulse/update-pulse-u8230edition-1.0-core-signed.zip instead of update-pulse-1.3-core-signed.zip.