This might be true, but I personally find it pretty embarrassing that Microsoft has made more contributions in terms of code than Canonical to the Linux kernel tree (as of a few months back when GregKH gave a talk at MS).

Don't get me wrong, Canonical is within their rights to do all of this, but from a moral perspective I think they owe it to be doing more towards contributing back to others' work instead of always promoting their own projects in Launchpad