For a fairly good collection of people's experience with what RAM does not work well with MSI nForce boards, check
this thread over at nForcersHQ.com.
Also, MSI has two variants of an ILSR board. There is the
K7N2G-ILSR, which is the IGP (onboard graphics) nForce2 board. The major difference between the two, other than the graphics, is that the
K7N2 Delta-ILSR supports 400MHz FSB processors. In short, I don't know about crucial because I have some 512MB sticks of Corsair XMS and it works great. Check the nForcersHQ link before you buy or see if anyone with the board can confirm the Crucial will work (it probably will but I can't say for certain).
[EDIT]I looked at Newegg for the Delta's, it's where I bought mine so I was pretty sure they had them.
Link. I prefer the Delta-ILSR just because it is more feature rich, but I think either are nice boards. (I have the ILSR version)[/EDIT]
\Dan