The present invention provides novel compounds with histamine-H3 receptor antagonist or inverse agonist activity. In particular, the invention provides a compound of Formula I, or a pharmaceutically acceptable salt thereof, pharmaceutical compositions comprising the compounds, methods of treatment employing these compounds and compositions, and intermediates and methods for making these compounds. The invention provides methods of using compounds and pharmaceutical compositions to treat obesity, cognitive deficiences, narcolepsy, and other histamine H3 receptor-related diseases.