Running anti-virus software is akin to locking the barn door after the prize horse has escaped.
SIP is a fun feature, but I think it has the potential to be more. I agree, it's "nothing more" than simple collocations, but I'm not sure how that's a critique. In the end, all software boils down to simple assembly instructions, nonetheless the magic emerges.
For further commentary, see this blog post. SIP is just simple collocations, but that's exactly what makes it so appealing. It's moving indexing and search in a more semantic direction, but in a way that's reasonable to design and implement.
This is probably premature, but I've even heard some pundits compare SIP to PageRank.