Australian company RamCity have the extremely well priced Crucial SSDs available with full, easy to follow installation instructions available online. RamCity's service is excellent with the drive arriving the next day after I placed my order.
I went with the Crucial M4 256GB 2.5 inch 9.5mm SSD which slightly larger than the original standard hard drive. I purchased the transfer cable as well and proceeded to clone the old drive and install the new SSD. The whole process was ridiculously easy and the instructions available on the RamCity website were easy to follow.
Once the new SSD was in place I fired up the Macbook Pro and everything was there, identical to how it had been a few minutes earlier, except way, way faster.
It is seriously fast now and the computer is now, more than ever, a pleasure to use.
If you are wanting to give your computer/laptop a new lease on life, this is the way to go!