OK, so I read all this and I still haven't seen the answer.

Is there a PPPoE client for the N800 or not?

The WLAN routers that Alice gives out with their Internet service in Germany do not allow you to automatically set the Username/Password in them. You make a new "Network Connection" in Windows and through the wizard you can enter the UN/PW.

No such option on N800?

PS: Even if I could hack my router and get it in (I've tried and gave up after 3 hours), every time I go to a friends house I'd have to hack THEIR router just to check my email..

Anyone?

Likely not, yet, but one could be compiled for it, like Roaring Penguin RP-PPOE. I'm not sure how you could get it to work with wifi though. Typically PPPOE Linux clients are used on wired ethernet connections, so the N8x0 setup would likely require a fair bit of Linux work under the GUI covers. (As far as I know.)

I would focus on configuring that ISP device with PPPOE credentials, or replacing it with one that can.

Another possibility is to introduce a new device behind it that translates from PPP/Ethernet to wifi and normal ethernet. If it has a wired port for connecting a PC/laptop that would expect to run the PPPOE client, add a PPPOE wifi router there and connect your wired and wireless devices to it.

Well, I have four good friends that have these routers that require logins. Therefore, I need to buy four routers. I was hoping a simple login app existed so I could just enter the UN/PW and save it.

I think the Penguin RPPPoE could work. I can connest wirelessly to the WLAN router easy enough. The problem is from the router to the ISP - I need to log in. With a laptop you can do it with WiFi or wired Ethernet.

It's such a simple thing and is it so uncommon? I know others that have this same situation but with different ISPs.

I've just rebuilt rp-pppoe, have a try. It's called pppoe (duh!)

There's no gui (although I see something existing in tk which I've also ported but .. we don't need no stinking gui!), then you have to use pon/poff

You'll need ppp also.

I have no ppp connection to try so you're on your own

The typical answer is to use a router to do the
job. Sympatico in Canada moved to PPPOE a number of years ago, before PPPOE support was common. People were forced to use a crappy client on Windows (98?), and David Skoll wrote rp-pppoe as a reaction.

Most people I know have routers that they control to act as the PPPOE gateway, so they can network their home devices easily without dealing with pppoe on each.

For example, little network printers, etc. It
complicates matters to deal with PPPOE on
every typical home device. Wii, xbox, etc. (Plus you can't control what home traffic is traversing out to the ISP.)

It would be interesting to see the details of what they've done. Ie, do you get an IP before you negotiate PPPOE? Or do you do some point-to-point wlan connection, then negotiate PPPOE?

Good luck!