This post is a meta post. Here’s the list of the features that are not currently working on Android. Feel free to append posts here when you’re finding new ones.
If you post here, also, please be ready to edit your message to remove the item once it’s implemented.
So, let’s start:
 Modal dialog: Android doesn’t support “modal” windows, so a workaround is used to use “asynchronous” dialog instead.[/]
 Text editor using the native version (so you could use any soft input/keyboard)[/]