Why I can't use speech-to-text feature (mike buttons are disabled)?

To enable this feature, you have to install Voice Search App

Do I need a camera ?

Nope, you can use this app, but you can't "photo" or "video" your ideas

Where I can find recorded files ?

Texts are saved in app database, but if you want to copy audio, video or photo, you can find it on your SDCard in
/android/data/com.scurab.android.idearecorder/ .
Be carefull about deleting/renaming these files, otherwise app can't show it

How can I send my note to someone else ?

Just long-click on your Note and select send and choose app which you wanna use to send your idea :)

What formats are used for data ?