Do we have an idea of the longevity of these newer flash drives? I've heard that compact flash cards always fail after a certain amount of time and I wonder if the same is trie for ssds. If not, I'm totally ready to get my soon-to-be-bought mini a 64 gb ssd for my OS (well both of them, osx and Vista) and apps and a firewire 1tb external for much storage. Safe solution?
The newest generation (non JMicron controller) SSDs appear to be very, very good. They are a little pricey right now, because they were just released - but that is how I would go if I were going to buy one.
The two models that appear to be the most reliable choices (although others here have successfully ran on older SSDs) are the Intel X-25M and the OCZ Vertex line.
As far as how long they will last - I don't think anyone can state 100% since they are relatively new. The OCZs come with a two year warranty.
As far as Manufacturers specs most good SSDs are spec'd at 1,500,000 hours MTBF (mean time before failure) which means that these disks are designed to last for 170+ years! The fact that they are relatively low heat and do not have moving parts like traditional HDDs, seem to indicate that they are capable of lasting for a very long time.
I have been watching the prices of SSDs, and it seems as though the Vertex line is dropping in price almost every two weeks. The longer you can hold out for one, the cheaper and larger capacity it is going to be. NewEgg has the 120 GB Vertex for $349 now. I think last week it was over $400 and the Apex (a JMicron controller with extra cache and internal RAID 0) 120 GB was about at the price the Vertex is now. I don't know how quickly they will continue to drop in price, but 120 GB of SSD speed is looking very nice!
BTW - I'm planning on doing the same exact thing - SSD internal disk with large 7200 rpm FW800 external disks for general storage.
With everyone updating their minis - it would be cool if we can get groups together and have mini update parties! I remember when I was a kid, I used to go to these Commodore 64 disk swap parties. Everyone would be there with hundreds of disks and dual floppy drives, just copying software back and forth (ohhh, the good old days...).