Adding shapefiles to PostGIS database

Try shp2pgsql. The basic syntax is like:

shp2pgsql -s SRID SHAPEFILE.shp SCHEMA.TABLE | psql -h HOST -d DATABASE -U USER

I always find this cheatsheet from http://www.bostongis.com useful. If you scroll down a little, you will find simple examples on how to load data.

Hope it helps.

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 your were using OpenGeo earlier.