Here are few tips that I find very useful, if you want to check the canvas info hold ALT+LMB on the left corner in the status bar where is the size of the doc., that way you can quickly count where is the middle of the canvas. For precise placing of the guides go to view-new guide and enter the exact number for example if the canvas is 1024x1024px enter 512px and thats it fast and precise. Also if you place for example the guide horizontal and you need it vertical, just place the cursor over the guide press ALT and move it very slightly it will rotate for 90 :) Tihomir

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