The best practices for this sort of thing:
- Don't keep too much money and valuable jewerly around. You should have no more than a couple of thousand dollars lying about.
- Keep the exterior of your house clean and well-lit.
- Gates and doors, even if not locked, should be in good repair and consistently closed.
- Secure stuff like bikes, lawnmowers, etc in a place not visible from the outside of the street, preferably in a shed.
- Have decent locks and keep accessible windows closed and locked when you're not home.
- Get a dog.
In terms of electronics and such, you're always at risk for some crackhead busting in your door and grabbing your iPod or whatever. Thieves don't really care about clothes... they want items quickly converted to cash: small electronics with resale value, cash, jewelry. Keeping things locked and having a dog are probably the best deterrents for that scenario.
More professional/organized burglars who rob houses during the day stake out a neighborhood and look for places where their presence won't be noticed. If things are clean and consistent, your neighbors, police patrol, mailman, etc are more likely to notice something awry and call the police. That's a risk factor for the "pro" thief, who will more likely look for a softer target.
If you live in an area where there has been a burglary spree or you are really worried about this, get a basic, centrally monitored alarm system. If you're not living a flashy lifestyle and are deliberately thinking about ways to look like you don't have anything, it is money well spent. If you are living a flashy lifestyle, unwanted attention comes with the territory. In any case, feeling safe at home is something you need to be able to do.