Is phonegap or other similar system, ready for "real" apps?

I'm looking for cross-platform layer for mobile developement.

http://www.phonegap.com/ looks most promi开发者_Go百科sing for me: No need for multiple development environments.

But: Is it ready for real apps? Stable?

Is it really cross platform (for implemented APIS), or you need to write platform-dependent code anyway, like in old Java ME days?

Which alternatives would you suggest?

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When I looked into this I thought Titanium looked the best.

Unless you're planning on writing games in which case I'd look at Unity.

Please bear in mind that cross-platfom development really dumbs your app down as devices and platforms differ so much. Cross-platform development tools like this are really only for simple apps or for apps with non-standard interfaces (Apple calls these type of apps "immersive apps").