If you think that's bad, dual-core chips show as four.
Nothing special to optimize. The usual RAM & HD optimization always helps.
Here's Intel's overview of HT:
http://www.intel.com/technology/hyperthread/
Individual productivity apps won't show a dramatic difference but many of those run nicely on fairly old boxes. Where you'll really notice the improvement is on anything that taxes the processor and was written to take advantage of multiple thread execution. Or, crunching with two intensive apps at the same time.
People running single-threaded grid apps have become fond of HT for this reason. It isn't a two-fold increase since not all processor functions are duplicated, and there's overhead, but 50-75% net gain isn't unusual.