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Useful site, handy for looking up board-pulls! I use them quite a lot, not just mosfets but bipolar and other types too. The specs they put in the boxes aren't always accurate though - always check the data sheet!
I always use components101.com it has been a lot useful especially when I have a handful of IC's which I have not used before.
They provide pinouts, specs, alternatives, application circuit explanation, usage tips etc.... but for some series designs the information will not be enough and I always have to download the datasheet which is also provided by them