EDIT *
Læs:
"bad news, sorry
You can't use the laptop screen, because the HDMI port on the laptop will be 'out' only (as is the HDMI port on your PS3) - the laptop screen can't take an incoming signal from that to display on it's screen.
You then have a few alternatives - none of which I've tried, but might work...
1) HDMI
HDMI to DVI convertor, then DVI to VGA convertor. There is no obvious reason why this wouldn't work that I can see - HDMI to DVI definately works on PS3s, and DVI to VGA I believe works on PCs...
BUT HDMI is capable of sending out HDCP encrypted signals, whereas VGA doesn't support this - and your monitor probably doesn't either.
Some owners have reported problems with HDMI > DVI giving a blank screen - though it works fine for me on my non-HDCP monitor.
2) Component
A more expensive option is a component to VGA convertor - something like
http://www.consolesandgadgets.com[...]
(which I also haven't used - but the spec says it will do the job)
On the plus side, component doesn't even try to support HDCP, and the PS3 knows this, so whilst you will 'only' get 1080i (some places say less - I'm not sure to be honest) signals from blu-ray discs (1080p requires HDCP I believe), that should still look good enough
3) HDMI direct to VGA
HD Fury. Again, not something I've used, but it appears to have been made specifically for what you are trying to do
http://www.hdfury.com[...]
not cheap though
google for HD Fury - about £60 seems to be the going price.
Hope that helps! "
--
/Gabriel sativa