I would benefit significantly by the availability of bigger drives. My desktop system has a motley assortment of drives at present and it's quite a pain managing all those seperate volumes - mostly 400 and 500GB units at present.
And no, I am not interested in buggerising about with RAID and spanned volumes or any of that other crap. Two reasons: (a) simple systems are good, solid, reliable systems, and my data matters; (b) I don't have the time or the interest to fark about setting up a large, robust, spanned volume system; I just want to store a lot of data the cheapest, most reliable, easiest way, and that is to use about 10 400 and 500GB Samsung drives, each drive is a single NTFS volume, each of the 5 or so primary volumes has an off-line, off-site mirror which I perform manually, not very often because most of the data doesn't change a lot. Often, it is sufficient to make the backup and the eternal round of capacity upgrades a single operation: e.g., replace a 400GB unit with a new 500, copying the data over to it, and then making the 400 my off-line backup and discarding the older 300GB backup drive.
Nevertheless, it would be more convienient to have a smaller number of drives - say 3 data drives and three backups. 1TB would do that nicely now, but I'll presumably start replacing the 500s with Samsung 750s (or possibly 1TBs) once I've replaced all the 400s with 500s. Yes, you can get those sizes already, but not in Samsung (at least not last time I checked, which was November) and I won't touch any other brand. Also, it doesn't hurt to wait until the price becomes a bit more reasonable and the product has been out long enough to have had the rough edges knocked off it - not that Samsungs ever seem to need that, they hang back a bit and don't release stuff till it's right, in my experience.
But the place where a bigger drive would really help is in the Thinkpad. I'm stuck with an 80GB boot drive and a 160GB data drive at present, and it's just not enough. OK, I could swap the 80 for a 160, but that's the largest size available in PATA, and to use SATA I'd need a new Thinkpad, and if I do that I'll be stuck with a crappola 15.4 inch shallow screen, which I'll hate. So I'm putting that particular evil moment off as long as possible. But when I do finally switch over, I'll want as much storage as possible - 2 x 1TB would be fantastic.