Though the shutdown and spending cuts by the U.S. government are taking a toll on IT sales this year, market surveys and financial results from the likes of Apple and Facebook this week show some positive signs for tech."In Forrester's semi-annual US tech market update, we conclude that the Federal budget sequestration, the two-week Federal government shutdown, and the fallout from threats to not raise the Federal debt ceiling have shaved about two percentage points of growth from business and government spending on technology goods and services in 2013," said Forrester chief economist Andrew Bartels in a blog post Sunday.As a result, Forrester this week reduced its 2013 forecast for U.S. business and government purchases of ICT (information a