Not to be disrespectful at all.. but I disagree with just about every tip given here. I too fell prey to the "oh no.. don't do that!.. it will kill your drive faster" advice and moved as much as possble off my SSD array. Big mistake if you are after productivity with larger files and access intensive programs. My vid/gfx workstation is modeled after that very requirement.
Is like moving the most required aspects of a fast vid/gfx machine to the slowest portion of the hard disk. Not really the most preferred method if you think about it and would be like downgrading your systems speed potential after having spent the money to make it as fast as possible and quite counterproductive.
I use the crap out of my system(even scratched well over 100 gigs worth of vid workflow per day on occassion) and keep all the programs on the SSD. It's what they were designed for with ultra low latency and huge small random performance being their strong point.Need to keep in mind that an apps typically accessed files are not contiguously written any more than an OS's.
And lifespan concerns with SSD?.. that's fast becoming a major fallacy due to the fact that many are even going well beyond their PE/c ratings and there are also some tests starting to surface around the net where some are purposely trying to wear out the drives to find these limits.
http://www.xtremesystems.org/forums/showthread.php?271063-SSD-Write-Endurance-25nm-Vs-34nm
PE/c ratings for nand are "minimum" ratings and the math is very simple to do for rough estimates. Capacity x PE/c = total writes in GB's. On a 120GB drive they are WELL into the hundreds of Terabytes. I've got 5 Terabytes written to EACH one of my Vertex 2's in a 6 drive arrays and do not worry about the write endurance one little bit anymore. By the time it's even a concern?. I will have moved these things into netbooks(that is, if those drives aren't already faster) or put them into an external e-SATA/USB3 enclosure. They will seem like small overpriced USB sticks before I have the chance at burning them out. Seriously dramatized issue and many are starting to realize it more and more as time goes by.
And as for scratching the temp stuff to HDD?.. well?.. I too tried that and the latency of HDD can and does show up when you rely on HDD too often. Most often underestimate the storage speeds read/write requirement as the SSD can only write as fast as it can read from the HDD(although the access times are still miserable once you get spoiled form actually having the files stored on the SSD itself), and write to the HDD as fast as the SSD can read. Have to balance out the OS and storage volumes capability to really optimize the balance.
So,.. having a 6 drive array on my system wouldn't give much benefit(unless I store all my data ON the SSD which would require another line of equity to implement.. lol) if I didn't have an 8 drive HDD array to pair up with it. Not saying everyone needs that kind of speed but I know for a fact that no one dislikes it when they can transfer/scratch 5 gigs in just 7-8 seconds.
Same with pagefiles. Even Intel themselves says where better to put the page file then the next fastest file system on the machine. Ram,.. then SSD,.. then HDD. If you have 6 or 8 gigs of ram anyways?.. don't even sweat it as you'll rarely bump into the usage of the swap file anyways. I have 12 gigs but VERY rarely ever ran out even with 6 gigs and even then?.. I had to have just about every app imaginable open on my machine to ever run into the need for a swap. In fact.. I have not used swap files for many years with only some temp config testing in the last year and a half due to all the SSD tweaks advice/dramatization being perpetuated.
My moto is.. "buy em'.. use em'.. burn em'. You'll be looking at full system upgrades before they're even fully burnt, anyways.