Your computer is him compatible with windows 7?
It is question has who answers microsoft, with software « Windows 7 upgrade advisor« .
For those who still hesitated to download Windows 7 RC, to test it and why to buy not him has the exit, but who were a bit recalcitrant as for the fact of duty re - to format to come back under a stable BONE if drivers had not gone out yet, windows make a gesture.
Instal Windows 7 Upgrade Advisor, and begin the analysis having connected all your peripherals (to be on that the scan takes into account all your external apparatus).
Click to extend!
Once the ended test programme gives you the state of your equipment, and your software. If it is green, it is because you are ready to pass in seven, otherwise, it will be necessary to wait!
Click to extend!
EDICT of August 10th, 2009:
Click to extend!
For those who would like to see which windows 7 to choose according to the BONE of origin, it is enough to consult this splendid picture Thank you microsoft for this easiness of understanding 
Download Windows 7 Upgrade Advisor
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After test of this application, I have could pointed out that quasi everything pc can welcome W7 notebooks (but has my opinion ca go surement to have a hard time)