Here is a tip I use to keep Black Swan loaded into the background on iPhone's iOS 4.
- Download a full screen web browser app that supports saved states like Pefect Browser - Fullscreen.
- Open https://voicecentralwe.appspot.com/voicecentral.html?browser=true&tab=sms in Perfect Browser and set it as your home page. For alternative URLs, see http://www.riverturn.com/forums/viewtopic.php?f=3&t=138.
- Set the browser to full screen and voila, multitasking Black Swan. Once Perfect Browser is open for the first time, you can then open Black Swan subsequent times with no loading. This is great for direct dial phone calls. It also works and looks better than GV connect and the Google Voice web app by Google.