Ok so I have a Macbook Pro which I bought almost exactly a year ago. It was a replacement for an old dying Mac Pro. I love it, can't believe I used to be restricted to a desktop. Brilliant machine. However over the past few OS updates (I'm running SL still) my old copy of Adobe Design CS3 is just throwing up error after error. The truth is I not only don't feel a need to update but my circumstances have changed dramatically since I bought it and I just can't afford to shell out short of £1000 for an upgrade. However my problem is aside from CS3 I really don't run any older applications that would prevent me upgrading to Lion. I like the Apple OS very much and would love to stay up-to-date with it. Especially given how cheap it is to do so. So last night I was considering upgrading to Lion and perhaps installing an old copy of Tiger from my Mac Pro. Tiger ran CS3 pretty smoothly and it's likely the only time I would boot into it. However just to add to all of this work have ordered me a copy of Windows 7 to bootcamp. At work I would use this for very minor jobs however with it installed I wouldn't mind putting a few games on there (the only thing I miss from owning a windows PC). Would it be possible to run 3 OS from my macbook pro (specs below). How much space should I give each install and would I notice a performance decrease? Processor Name: Intel Core i7 Processor Speed: 2.66 GHz Memory: 4 GB HD Capacity: 500.11 GB (if I'm missing anything just ask) Any advice would be appreciated, thanks!