If you are clipping a lot of text bits from the net to DEVONthink, it could be convenient to use an “Inbox” group. Create a group named “Inbox”, and, if you are sorting your groups list by name, maybe add a “•” or a space character in front of its name so that appears at the beginning or the end of the groups list. Select your new Inbox group in the Preferences panel, Import tab, as the destination for new notes.
Now, new notes that you create, e.g., via the Services menu will be automatically filed in the Inbox. Drag notes and clippings as well as documents you want to import to your database into the Inbox group first (use the Groups panel for even more comfort) and file them later when you have a few minutes to spare for this.