I have never heard of this service before until Wojitas mentioned it to me. It looks like a new BlackBerry application that makes a backup of your contacts on their servers and lets you share content with services like YouTube, Facebook, and more.
They have a free and premium account option but I cannot really recommend the premium account except for one feature. It lets you restore all of your contacts back to your BlackBerry more than once a year. I guess this is targeted at Europe due to the prices only being in Euros but it is definitely worth a look if you want a free solution for backups… Though you could always use Google Sync…
Personally I think that if you are willing to pay you would be better served with a hosted BES solution or SmrtGuard at the very least.
Check it out at http://www.pleex.com and let me know what you think. You need to register on their site from your PC/Mac first before you can download the app.