At the moment, I got a Canon Pixma MP610 all-in-one printer. It has a USB connection and a PictBridge connection. But no ethernet connection. Is there any way to connect this printer to my router (Belkin N1), so I could use it as a network printer? My budget is about $100. And if possible, it shouldn’t require external AC power.
sure, you just need a simple adapter like this
BTW: startech are cheap & generic, so, i would suggest you get a decent brand like netgear
I didn’t know that you could connect an external network adapter to a printer. I got such an adapter around here somewhere. I’ll try it tomorrow 
[QUOTE=RH]
I didn’t know that you could connect an external network adapter to a printer. I got such an adapter around here somewhere. I’ll try it tomorrow
[/QUOTE]
yeah, basically it works like NAS (network attached storage) look it up on wiki
Edit:
http://aycu29.webshots.com/image/49948/2000087710541997784_rs.jpg
but, an external network adapter needs drivers to be installed on the host device. So I don’t think that it’s gonna work. But I’ll try it anyway.
I tried it, and it didn’t work unfortunately. I did found something, here. But these devices require external power, and I don’t have any wall sockets left 
theoretically i think it should just work, because, it’s just connecting to ethernet, the item you found would work, however, i think it like using a sledgehammer to kill a spider, basically, overkill (but i’ve no experience with networking, so, i’m relying on wiki & google, which usually works)