I want to convert polygons into points using QGIS.
I know how it's done in ArcGIS Desktop.
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If you want to decide on your own point spacing, you can use the Sextante Toolbox with SAGA functionality activated (you'll need to install saga - www.saga-gis.org/ - and specify the installation path in sextante). Use the 'polygons to line' geoalgoritm followed by the 'line to points' one. You can create a model in sextante that combines these into one step as well.
Note: you have to make sure you install the right version of SAGA - I think its 2.0.8