Ahh! Can't comment yet!
What Haziq posted would be the correct commandline way to do it Sam.
TABLE is just whatever you want to name it and would be the name to use when calling it from a query, the table will be generated upon import.
If you become lazy like me, I just use the awesome SPIT (Shapefile to PostGIS Import Tool) available as a QGIS plugin to import all my shapefiles now. Assuming you are using QuantumGIS as you said youryou were using OpenGeo earlier.