pasting text via keyboard

You all know the problem that sometimes if you mark text in e.g. a browser and you paste it in a text box that the text will be
pasted with middle mouse click on the place where the mouse cursor is.
This behaviour sometimes sucks because it is not the place where you want the text (like in s9y blogs).
There is the possibility to mark text via the mouse and to paste it via the keyboard with the keys Shift+Insert.

Thanks to deifl for this tip.