The title says it all. Any and all tips / tactics you found that worked for you when getting an app out there are welcome.
The best way which worked for us (SettleApp - little indie app) was recommendation by friends and more importantely by influential friends. When they spread the word on their twitter accounts, blog, fb pages,... It can help a lot.
After launch a good idea is to ask for reviews on the local sites that are willing to write about local apps. (This works really well. Especially when you live in small country.)