Are there exist any registry for reserved key binding?

[Oleksandr Gavenko]

Some of key binding reserved by Emacs distribution (like C-x ..., C-c ...).

Some of key binding reserved by external packages (like C-x C-j ... for
jabber or C-c , ... by semantic).

Some key binding recommended on emacswiki (like C-c r for org-remember).

When I make own mode I would like to select key bindings that does not
interference with most other packages/modes.

What are the best practice/recommendations to archive this goal?
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Best regards!