jQuery Tip Cards is a plugin for creating a card layout that let your user flip through it like you see on Google Tips. Created by Pete R..
Here is a Gmail user interface mockup that you can find useful for your work. Free PSD released by Joel Unger.
Gmail UI PSD template
Fully editable version of Google’s search page. PSD mockup made by Aubrey. It can be really useful for studying how it’s made Google.
Google Search Engine Results PSD mockup
Do you need some Google play & Apple store badges? Here you have a free PSD containing both. Designed by Wells Riley.