well it would seem that people have tried and got it to work successfully

http://www.taconuts.org/articles/2000/dec/3/page1.php
http://forums.devhardware.com/archive/t-12021
http://www.crapemail.com/mod/mouse/

and this place has a few 'interesting' mods (not necessarily relevant to the discussion but interesting nonetheless!)e.g.
http://www.metku.net/index.html?sect...heel/index_eng

but personally I'd be inclined to agree with foxy to a degree - I'd say yes it is possible if your careful but you may lose some of the responsiveness of the mouse - like foxy indicates the optical sensor would only pick up light from a given wavelength range - and there are no guarantees that the LED would give out any liught in the relevant spectral range

having said that..... maybe you ought to ditch the intellimouse and take a look at this one

http://www.xoxide.com/xoliupmowfan.html

- maybe search around for similar? I'm sure I've seen an intellimouse with blue light.... but I might have hallucinated that

Z