OllyDbg now supports "always on top" option for its MDI winsows (called from the Appearance menu). This option means that selected MDI window remains visible on the top of other windows.
Adding this useful option to a plugin is a matter of minutes. Plugins create MDI windows by calling Newtablewindow or Quicktablewindow. In the structure t_table, passed as a first parameter, you must specify flag TABLE_ONTOP, as in the sample program. To support this option, plugin must pass message WM_WINDOWPOSCHANGED to default plugin function (see here).
That's all! Easy, isn't it?