Okay folks, I kept waiting for someone else to do this so I didn't have to go through the work, but I am horribly impatient, sometimes more so than I am lazy! So I present to you Humancyborg's Nexus 2.1 ROM with cooked in wi-fi tethering! Special thanks go to Humancyborg and haxzamatic for the original ROM and visual updates from this thread at alldroid:
http://alldroid.org/viewtopic.php?f=210&t=1078
For the tethering app and helper, thanks is owed to webacoustics and ChevyNo1 at droidforums.net from this thread:
http://www.droidforums.net/forum/droid-hacks/10219-tether-capability-android-wifi-tether-wireless-tether-root-users-24.html
I have verified the wi-fi working on this ROM, I actually uploaded it to mediafire through the wireless connection! To start wi-fi click on the black helper widget, a popup will say tethering enabled, then you can launch the app to view stats. To disable tethering, just click the widget again, simple as that. NOTE: Due to limitations in the current app, only ad-hoc networks are supported, and you must connect to the wi-fi hotspot right away, because if you don't it won't show up anymore.
ROM is simply a nandroid backup, so backup your current settings, format data, cache, and system, and then restore this one instead.
AS ALWAYS, YOUR PHONE, NO ONE IS RESPONSIBLE FOR IT BEING MESSED UP! ANYTIME YOU FLASH CUSTOM SOFTWARE, YOU ASSUME THE RISK. IF YOU BRICK, I AM NOT RESPONSIBLE
Get it here:
http://www.mediafire.com/?vyltmjznjcl
And for further enjoyment, this is while tethered wirelessly:
Remember to click THANKS!!!