"What are offline-browser?" These "browsers" allow you to input a starting url and they will crawl you site, downloading images and/or pages as they go. The idea being that could then browse the site locally. If they aren't connected to the internet, it would be hard for them to sign up with your favourite sponsor!
Here's a list of some that are available. These programs work by localizing your site links, they may attempt to localize sponsor urls as well. Since they don't pass anything in the HTTP_REFERER variable, you could use this fact to block them rather than coding an HTTP_USER_AGENT condition for each of them. note: be careful that you don't block friendly SE spiders!
Backstreet
Black Widow
Caitoo
Curl
Disco Pump
Download for X
eCatch
Eclipt Mirroring Tool
FlashSite
GetBot
GetRight
GetSmart
GetWeb
GNU Wget
Go!zilla
Grab
Grab-a-site
Grab URL
GREED
Htget
HTTrack
iFox98
inSite
Internet Angel
Internet Ninja
JOC Web Spider
Konqueror
MemoWeb 98
mHtml
Mirror
Monica
NavigatorCompanion
NCBrowser
NearSite
NetAttaché Pro
Net Vampire
Networkz
Offline Explorer
Page Sucker
Pavuk
ReGet
Site Eater
Snarf
Surfbot
Teleport Pro
W3mir
Web@pc
Web Copier
Web Crawl
Web Devil
Web Downloader
WebGrabber
WebMirror
WebReaper
WebRecorder
Web Retriever
WebRobot
WEBsaver
WebSnake
WebStripper
Web Tondeuse
WebVCR
WebWhacker 2000
WebZIP
Wget
WWWCopy
WWWoffle
X-FileGet
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