Now, if you're wondering how to get the big icons up on the wiki, this is a how to guide to help you out.
Step 1
Go to the finder and locate the application you want to get the icon off
Step 2
Right click (or ctrl and click) on it and select "Get Info"
Step 3
Click on the icon so it gets highlighted at the top left of the new window/inspector.
Step 4
Go to Edit->Copy
Step 5
Open Preview (Applications folder)
Step 6
On Preview's menu go to File->New from clipboard. This will open it up
Step 7
Make sure the biggest icon is selected. Now go to File->Save as
Step 8
Save it as a PNG file somewhere. It is now ready to upload
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