Opera allows you to easily drag-n-drop custom buttons from a web page straight onto your toolbars!
How to add a button - Simply drag a link to your toolbar and try it out (hint:drag upwards). A requestor will pop up asking whether to install the button (displaying the command the button performs to confirm 'what-it-says-is-what-it-does').
How to remove a button - If you don't like a button, you can simply right-click on it and "remove from toolbar".
Where to place buttons - The Personal bar and Menu bar do not allow buttons to be added to them, but Status bar, Main bar, Navigation bar, Address bar, the ends of the Page bar, most Panel toolbars and the Mail View bars are all fine.
More buttons - Go to PowerButtons to find custom buttons with advanced functions. Other button pages are listed under Button Creating Tools.
How to create your own - If you want to make your own buttons, their syntax and all available commands can be found in AllActions. See the list of Button Creating Tools for more information, more custom buttons and some tools that make it easier to create your own buttons.
Related pages - See SearchPlugins and CustomSearches for buttons and fields related to searching and CustomButtonsSystem for buttons that perform system related functions.
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Polish (polski)
You can make your main menu display as a button, then turn off the menu bar (you now need to create a keyboard command mapped to "Enable menu bar | Disable menu bar" to do this, or use of the toggle buttons below) to save space:
Other menu buttons:
[Mark read menu] Item, 44004 = Mark as read Item, 44005 = Mark as unread Item, 67362 = Mark all as read Item, 67354 = Mark and select next unread
[Reply menu] Item, 26529=Reply Item, 26530=Reply all
[Read Mail Menu] Item, "Open Mail" = Read mail & View hotlist, 7 & Focus panel, "Mail" Item, "Close Mail" = View hotlist & Close page
Note: There is currently a regression in V7.5 and V8.0 that stops scroll bars toggling automatically, please use CTRL+F7 for the moment.
Same as above with added action when holding mouse over button (V8+)
*Hidden Menu - Hold mouse over button to activate
Management dialogs (Some more can be found in the security buttons section):