Tomboy does not provide as many features as BasKet, but it might be the right choice for those using GNOME. It provides global hotkeys, spell-checking while typing, and several options for formatting the text, like highlighting. It can be embedded in the system tray and it uses a low amount of resources.
Formatting text in your notes
Another feature are the extensions, called add-ins in Tomboy, like the Export to HTML or Backlinks, which allows to link between notes. It also allows searching in all your notes.
Running in KDE with the default browser set to Konqueror won't open any links (I noticed this at many GNOME applications which run in KDE) but it's OK if you have Epiphany installed.
As a conclusion, although it's not as feature-rich as its KDE counterpart, Tomboy is pretty good for taking notes in a rapid fashion, considering you don't need advanced options.