There is a "Sponsored Link" appearing above your notebooks description Fuji Amilo offering RAM from click here for £52.88 512Mb sticks(inc VAT)
As to your question of whether Desktop RAM will fit,if your desktop uses the same number of pins (172/184 etc)then I can see no reason not to use it.(Other than the additional EEC,Buffered/unbuffered,etc cfg choices)
I have a FS Amilo D 7830 18 mths old, which I upgraded to 1GB after approx 6 mths use. This is fitted with desktop memory, but at the time Crucial only had a lissting for notebook memory for it which I ordered & returned.