Charger is a cool idea, but for it to work on a BlackBerry, it needs to be fully charged lest the BB phone warns you of "insufficient charging device." When fully charged, it appears to add about 1 "bar" to the BB's battery before depleting. Lastly, in 100% full sunlight, it will not stay ahead of the BB's normal battery drain even if the BB is "idle."
I still have my PSA luggage tags--perhaps the only ones left in existence, and they stand out in a crowd of black suitcases in the airports! Here's a publicity shot from their glory days!
Not being a blackberry/ipod person, I stuck my charger in my GPS case that always goes with me. It makes for a nice battery backup to the GPS unit. The GPS recognizes it as an 'external power source'.
You can also charge it up from your laptop if there is no sun. Pretty slick.