...Is there a way to flip back and forth between open apps as I would in a modern operating system?...
		
		
	 
Sure, just long-press Home to see your last 8 apps you have used. Tap the one you want to go back to. It will open right when you left off.
 
With Android you are two clicks away from any of your last 8 apps, no matter what order they are in. Once you get the hang of it, it is hard to go back to shuffling cards around to find the right one. 
 
I have an Android and a Pre. I am dramatically faster switching apps on the Android. You will be too. It is just like going from a manual transmission to an automatic. webOS had you do all the shuffling, moving, and closing. Android will do it for you. Android Multitasking is so simple, you don't even think about it. With Cards, you have to always be thinking about it.
 
See the 
Getting Started section on 
Multitasking for this example.
→ You are listening to tunes and start an 
Email. A Calendar pop-up says: "Get gift for bday party"
→ The store has it but the price is ridiculous. Use 
Barcode Scanner to see Best Buy has it on sale. 
→ You hear a song & 
Shazam it to see who it is. You 
rip an MP3 of it from YouTube. 
→ As you drive, you keep getting texts. You use 
Messaging speech to text to reply.
→ Best Buy tries to charge you full price. You show them their own in-store ad 
online.
→ You have voice mail. Use 
Visual Voicemail to hear the party is now at Olive Garden.
→ You get a Facebook that the party now starts at Olive Garden. You reply.
→ You use 
Voice Actions to 
say: "Navigate to Olive Garden"
→ At the party, video chat with a friend who's away. 
→ Take photos & HD video & post on Facebook. You 
Bump your number to someone new.
→ Later, you go back to the email and 
say, "I'll send more tomorrow."