How to remove categories slugs in WordPress

WordPress adds default category slug to your blog URLs, so a URL to your category page looks like myblog.org/category/receipts/

You can replace 'category' word with whatever you want, e.g. with 'food', so you'll get
myblog.org/food/receipts/
Better, but still not ideal - what if your blog is not about food only?

Surprisingly, if you completely remove the categories slug in Settings->Permalinks, leaving the field there empty, WP will restore the default 'category' slug back.

I want my categories URLs to look clean -
myblog.org/receipts/
It's better for humans and SEO (these two typically come together).
WP has no option for that, but there is a nice plugin:
WP No Category Base

Simply install it. No configuration required.
Voila! Here are you go: http://photocoupon.net/camera/