Having next actions staring you at the face can increase the chance of you remembering or deciding to complete them. Some people might print off their lists and post them around the house and it's undoubtedly a good idea to increase the visibility of actionable tasks for this reason but also to ensure you are frequently reviewing what needs to be done, without letting your lists become stagnant.

Here are a few applescripts I put together to get my OmniFocus Tasks to display on the desktop.

You can download the scripts here:

Due Soon | Inbox Count | Next Actions

Which refer to OmniFocus perspectives labelled 'Due', 'Inbox' and 'Contexts" respectively. You can alter the script to suit your own choice of perspective label. For example you may want to show only tasks that you see in the 'flagged' perspective.

In Geektool, you can call the scripts using the command 'osascript [script path]'. Then you can format and position the text boxes in a way that suits you.

I would recommend setting a long refresh period so as not to reduce the risk of the script interfering with your experience of OmniFocus as each pull will switch to the required perspective which can be a nuisance if you are trying to type something.