when your at home if you don't have a garage (or even if you do) get two 5 Gal buckets. THe big ones that go up to your knee. Get some quick drying cement, go to a garage and have them bend you two 3/4 - 1" rods into a U shape... Fill the 2 buckets with the quick drying cement, stick the rod in the cement and let it all dry out.
Chain your bike's two wheels to the buckets. It'll be harder to lift off the ground with two dead weights like that hanging on the bike.
When you're not home.... disk brake lock, clutch handle lock, motion sensitive alarm (so no one sits on the bike and tilts it). If you chain your bike to something, do that.
edit: the best alternative to the buckets if you've got a home with a driveway or something... Put anchoring hook in your driveway and chain your bike to that. You could also make a sonotube filed with cement in the ground next to your asphalt if you've got that, stick the U rod in there.