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SSD (Solid State Disk) could improve trading speed?
It will only enhance I/O, so it will help the boot time, and all I/O intensive operations, but trading tools are not I/O intensive.
So, my answer is NO.
But I am an old "storage" guy (my last real corporate job was at a big storage company). So in my home alone I have about 12TB of disks, and lots of RAID everywhere, etc
If the PC is used *only* for trading, then a 40 or 80GB SSD will be enough. But it isn't going to make things faster. The problem is if the PC is used for general use, you probably want several hundred GB and those are very expensive for SSD right now (still).
It depends which paramaters you consider to evaluate the 'reliability' factor. Surely SSD are better for shocks, vibration, temperature ratings; not so sure about long term use reliability. More ideas and data here.
Make sure you buy a drive that supports TRIM, make sure your mainboard controller supports TRIM that you are attaching it to (ie: most 3rd party HW raid cards do NOT support it), and make sure your OS supports TRIM. That should more or less handle the longevity part of the argument, aside from just a fluke failure.
