Upload manager for sharing files.
If you upload a lot of content and to a lot of different websites, you might be frustrated at times about how repetitive things can be. Check out Fireuploader.
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Testing your webpage using 43 different browsers versions
I found this amazing tool called browsershots while browsing today. It takes a snapshot of any URL using 43 different brands/versions of browsers. Its not instantaneous, but if you are willing to wait a few minutes it can save you a lot of pain.