By Brian Peat

A simple table
Who would have thought it would be this easy. Because of the nature of Tables in Keynote, you can paste a group of objects into a table cell. What isn't always apparent though is the auto scaling nature of the cells. If you scale the table, the cells resize, and ANYTHING inside the cell also resizes. So all you need is a single cell table and a group of objects.

Make your Objects
First, you need to create or place your objects to be grouped:

Group your Objects
Next, you need to select all your objects. The easiest way to do this is simply Click and hold the mouse down while you draw a large box around all the objects. Then choose Group from the Arrange menu. You should see something like this:

Creating the Table
next, click on the Table icon in the Keynote tool bar to get a blank table on your slide:

Adjust your Table
Now you need to adjust the table so that it is only one cell tall and one cell wide, and has no border. Click on the down arrow for Columns until it says 1, and do the same for Rows:

Now, click on the Cell border type pop-up menu and choose None:

Cut your Group
Now you need to select and CUT your group, so you can paste it into the cell. Select your group again and choose Cut from the Edit menu. Then click on the table TWICE to select it (you may have to click around a bit as the table is not visible now on the slide). Once it's selected it should turn yellow:

Paste in your Group
Now choose Paste from the Edit menu and your group should appear inside the table. At this point you should be able to scale your group up and down by grabbing the corner of the table. Here's a movie to show you how it works (it's a little sloppy as it was a screen capture using Snapz Pro X):

Conclusion
I want to personally thank nethawk for posting this tip. It's so simple, yet somthing you just wouldn't normally think to try. Now we can finally get around one of the most annoying missing features in keynote.