Mac OS X (10.6.6)
I wish to buy a Mac. Whether there any support for Malayalam language there?
+1 to nickshanks. Also, for typing in malayalam, you could try this neat site:
Good News! While reading the features of the upcoming OS X Lion, I found extended language support, including Malayalam! The fonts are probably the same as those by nickshanks, but they might be different since the original fonts were made for iOS devices.
Expanded language support
Twenty new font families for document and web display of text provide support for the most common languages in the Indian subcontinent, including Bengali, Kannada, Malayalam, Oriya, Sinhala, and Telugu. Devanagari, Gujarati, Gurmukhi, Urdu, and Tamil have been expanded. And three new font families support Lao, Khmer, and Myanmar.
Support for Malayalam language
