Re: amyway to delete admob
this site here looks like a good, currently updated (at least right now) source for a hosts file to block a TON of adservers.
Blocking Unwanted Parasites with a Hosts File
about halfway down the page, has a link labelled "To view the HOSTS file in plain text form."
download it in a real browser, and adb push it to /system/etc/ on your phone after adb remount...
or transfer it to your card and overwrite your /system/etc/hosts with it using root explorer, or terminal emulator, or some such.
it redirects the ad site requests to 127.0.0.1 (the local machine)
you can also use asadullah's suggestion above to add any missing sites to that if you want.
here, for the lazy, I'm providing a flashable zip to use in your recovery with the 7-23-2011 updated version of their hosts file. It may not completely cover your admob problem (haven't fully tested that yet but it definitely blocks some so far) but it's great in the browser. speeds up sites like xda quite a bit, even if it's still missing a few of the ad sites popped through the forums.
NOTE: even though the zip is supposed to be signed with a testkey, recovery won't flash it unless you turn off signature verification.