What is a good website to practice sight reading for piano?

Quite new to this site, slow in learning progress lately. I'm just starting to watch Lypur's piano vids again and I remember that sight reading is something that needs to be practiced every day.

Well, I don't think you need to find a specific site for sight reading material. Just pick a sheet music site that has different difficulty level of sheet music, for example G Major Music theory: http://www.gmajormusictheory.org/Freebies/freebies.html
Start with the easiest sheets and if you find them too easy then choose something harder and practice it. Start with Hands seperate sight reading practice unless you're already good at sight reading. Here's some useful info about practicing sight reading: http://www.pianofundamentals.com/book/en/1.III.11

Welcome to the forum Vmil

Here's a good site with sight reading exercices

Thank you, appreciate the help.

I designed some interactive flash games to help me with my sight reading
check out www.songsfortenors.jimdo.com/piano-zone

A good score to get if you want to practice sight reading: look for Kunz's 200 small canons (200 piccoli canoni)