I use a Netgear RedyNAS Duo and a Logitech Squeezebox Duet. It's a powerful combo that doesn't rely on a PC being up and running. I would check your manuals to see if you can do the same with your Philips. NAS boxes have many good uses as well as running server software and I chose my NAS based on Squeezebox forums and evidence of strong support for the unit on Logitech's website. So what deos Philips recommend?
In respect of finding stations with the SB, there are various search criteria and I would imagine you'll have the same with your box (genre, region etc). You can save the ones you like to your favourites making recall a simple task.
If you want UK stations and your box takes stadard URL's, http://www.radiofeeds.co.uk is a pretty good place to start. Make sure you pick a stream format compatible with your streaming device however.