Linksys WRT160N middle light??

Just below where it says Linksys, what it that light for?? When I had DDWRT on it it was orange yellow, but with Linksys firmware it is blue?

I had to look it up to be sure. Linksys has an "Easy setup" or something. When paired with Linksys branded wireless cards, you can have Linksys create a security code for you instead of setting it up yourself. With DD-WRT, you rendered that option as "gone". It is not supported under third party firmwares.

I wasn't a fan anyway. I got it on my WRT-54GS. The color indicated if it was on or not.