Global Trade Alert doesn't actually cover global trade but global trade restrictions. Its an incredibly informative database

on anything and everything that could impede trade.

Its most recent report documents that the global recession not only decreased demand for imports but also increased the supply of trade restrictions. "Since the first G20 crisis-related summit in November 2008, the governments of world have together implemented 297 beggar-thy-neighbour policy measures; that is, more than one for every working day of the year. Add another 56 implemented measures that are likely to have harmed some foreign commercial interests, the total reaches 353." 

and

"During the past three months the number of state measures announced which–if implemented would likely harm foreign commercial interests–has expanded from 134 to 188. The protectionism in the pipeline keeps growing–there is no respite here. This protectionist overhang could limit the contribution of exports to economic recovery. "