Actually, when you see it says you have no more room, it means that the spaces on the current window you have might not be enough.
The 'desktop', which you have 3 of them, are sized 4 x 4. Meaning 1 icon is 1x1 in size, 4 icons across, 4 icons down.
Some widges will be 2x1 (2 across, 1 down) or 2x2, or 4x1. The Power Widget is a 4x1, same with the Google Search Widget and Music Widget. The Calendar Widget is 2x2 and most of the regular widges are 1x1. Some of the 3rd party widgets will do 2x2, 2x1, but most will be 1x1 for the most part.
So when you lay out your windows, plan ahead on what you want where.
The 'desktop', which you have 3 of them, are sized 4 x 4. Meaning 1 icon is 1x1 in size, 4 icons across, 4 icons down.
Some widges will be 2x1 (2 across, 1 down) or 2x2, or 4x1. The Power Widget is a 4x1, same with the Google Search Widget and Music Widget. The Calendar Widget is 2x2 and most of the regular widges are 1x1. Some of the 3rd party widgets will do 2x2, 2x1, but most will be 1x1 for the most part.
So when you lay out your windows, plan ahead on what you want where.