When I was posting at Marlin talk, I did some research and came up with the following list of free target sites:
A 2-page compendium of standard type targets, game-play targets and critters in HTML, GIF or PDF formats.
http://www.airhog.com/targets_1.htmFrom the Beartooth Bullets site, standard type targets and a couple of critters.
http://www.beartoothbullets.com/misc/targets.htmA few colorful airgun targets for beginners.
http://airgunsbbguns.com/beginner-airguns-targetshooting-freetarget-printbletarget-.htmlBenchrest and airgun pistol targets.
http://benchrest.com/latino/html/targets.htmlTargets in Microsoft Word format.
http://www.cjrpc.com/Targets.htmSighting in targets and a couple of critters.
http://www.cjrpc.com/Targets.htm4 targets, including a squirrel and a deer, plus links.
http://www.doubleought.com/printable_targets.htmlA variety of targets including sight in, benchrest and critters.
http://www.varminthunters.com/targets/6 targets, including one of Osama.
http://www.dt-sports.com/bin.htmlA couple of standard targets and a couple of varmint targets.
http://www.egpworld.com/varmints/targets.htmAn interesting and extensive assortment of targets in JPEG format.
http://www20.brinkster.com/htraps/targets.htmlA really large selection of targets of all types in PDF format. This is a must see.
http://www.targetz.com/A very extensive, and colorful, target library, all of which are available together as one self-extracting archive.
http://www.targets.d2g.com/A good number of colorful PDF targets and some silhouette targets and Real Picture targets.
http://ourworld.compuserve.com/homepages/TPHaller/page3.htmlSome bold GIF targets, also available together in one zip file.
http://www.tnoutdoorsmen.com/targets.htmAnother extensive target collection in GIF format.
http://www.protargets.com/targets/index2.htmA variety of targets in different formats.
http://world.guns.ru/downloads/do05-e.htmA number of nice targets in JPEG format.
http://www.airgun.org/irtargets/Some nice JPEG targets.
http://www.angelfire.com/space/kaboom/targets.htmlA couple of good PDF targets.
http://www.midwayusa.com/Several zip files containing a variety of targets.
http://murraysguns.com/download/index.htm5 PDFs from Remington, including a nice turkey target.
http://www.remington.com/targets/papertargets.htmA bullseye target in PDF.
http://www.muleyenterprises.com/printable-shooting-targets/3 PDFs courtesy of the Indiana Hunter Education Program.
http://www.inhea.com/MISC/printable_targets.htmA neat collection of JPEG targets.
http://members.dodo.net.au/~syrokomla/st.htmQuite a few rimfire targets in PDF format.
http://proveit.www8.50megs.com/targets/targets.htmlPDF target collection.
http://is-lan.com/challenge/targets.htmTargets in GIF format from Sharpshooter.com.
http://www.sportshooter.com/improving/targetgallery.htm2 JPEG targets with unusual backgrounds.
http://stun-ningsales.com/SportStore/print_targets.htmA variety of targets in several formats.
http://www.tackdriver.com/targets.htmA pretty neat selection from Ammoman.
http://www.ammoman.com/targets/Targets from US Palma in PDF.
http://www.uspalma.com/Targets/targets.htmMostly silhouettes.
http://www3.sk.sympatico.ca/proszak/targets.htmlRimfire targets. The BDT is here.
http://rimfire.cc:81/targets.htmlTarget site from Germany.
http://www.schiessen-erzgebirge.de/sites/schiessscheiben.htmGood selection of targets in PDF.
http://www.mytargets.com/index.htmlBin Laden target.
http://www.hunt101.com/img/15364.jpgTargets from Glock. If you're on dial-up, this takes quite a while to come in, but it's worth it when you get there and check out the variety.
http://glockfaq.com/targets.htmDecent selection of mostly sight-in targets with a couple of Osamas.
http://warhammer.mcc.virginia.edu/ty/targets.htmlNice benchrest target site.
http://www.cctrap.com/~varmint/atarg.htmA target site from Russia.
http://www.ada.ru/Guns/targets/Nosler Varmint target.
http://www.nosler.com/target.htmlFrom Tom G in the Big Bore Rifles Section from the old Marlin Talk.
http://homepage.mac.com/WebObjects/FileSharing.woa/wa/default?user=tomncora&templatefn=FileSharing10.html&xmlfn=TKDocument.10.xml&sitefn=RootSite.xml&aff=consumer&cty=US&lang=enI haven't checked out the sites recently, so, if any of them are now defunct, I am unaware of it.
Enjoy!