*Raises both hands, jumps on desk, starts howling*
I have that same drive, and the 500GB before it. LOVE 'em. My MacBook Pro 15" has two drives, one is the 750GB Momentus hybrid, and the other is a slow 1TB HD. What I really want is two 1TB hybrids. This seems to be achievable much sooner than with SSD, and the speed is "good enough".
Beyond just going to 1TB, the other thing Seagate could do is go with massively increasing the SSD portion, and making it a full volume instead of cache, say, 128GB or more, and then allowing us to use that as a boot/app volume.
This seems physically possible today, but would add a couple hundred dollars or so...but would be totally worth it.
I see hybrids becoming even more valuable in the future as the SSD portion can grow to become even more useful before SSD-only becomes available at reasonable prices in the capacities we need.
(For the love of God, please don't reply to this comment with the word "cloud" anywhere in the post... we're talking TBs here)