Backups of photos and media of course!
And still multiple copies to be safe.
... and and offsite copy too
My current storage:
Small Portable: 16gb Sandisk Cruzer
Portable with a reader: GigaOne 40gb
Portable: Segate FreeAgentGo 250gb (I had about 1Gb space left on the laptop and 5Gb on the GigaOne - I was desperate at the time)
Home: 1 x Maxtor Basics 1TB (which I am going to rip appart at it is sluggish) and a Maxtor 500GB OneTouch (a nice fast performer)
If I had the money, I'd get an LTO4, a spare media library, a 6TB RAID6 and be done with it completely...