I am using a Dlink DNS 323 as my primary NAS. It supports raid 1 (hard disk mirroring). I download all my photos onto the drive. About once a month, I do a backup of all the important folders from this NAS to another single drive NAS so I that I have a duplicate. Call me paranoid but I have too many hard disks fail on me before and I don't think I want to have all my eggs in one basket.
I'm using my old PC which i convert it into windows home server, almost like NAS with a little more features. it backs up my laptops as well as stores my pictures in a RAID 1 like structure over 4 HDD. once in a while i play the pictures on the TV via a PS3 over wifi.
I'm also using the DNS-323. One of it's main advantage is the ease in installation and setup. Connect to Router directly. Very easily, it becomes a network drive in your Explorer.
On the Macbook, it's also easily detectable.
Yup am running the modded version. BT is good with it. Can run your own photo gallery with it. FTP, online file server and etc. I didn't really notice the fan noise but I guess there is some noise level bah.
Using a Buffalo TeraStation Live HS-DHTGL/R5 with my recently upgraded 1TB Western Digital Caviar Green drives to store. Works very well using previous OEM Samsung 250GB drives for 3 years continuous (hence I figured it's about time to retire those drives). I always set the system run on RAID 10, safe and fast at the expense of half that storage capacity. With the new drives, the NAS operates almost silently and with less heat due to the drives' low power consumption (each drive save me about $10 per annum in terms of electricity cost, there are 4, so total $40/yr)