Although there are many advertisments online but i particularly hate the flash ads which steal my precious bandwidth.
If u also hate advertisments from yahoo network which appear in Yahoo! Mail, Yahoo Groups etc and want to block them follow the procedure below

Go to your Yahoo Account Settings and update your country



Please add following lines in your hosts file

Host file can be found at

• Windows NT/2000/XP/Vista: C:\windows\system32\drivers\etc\


• Windows 95/98/Me: c:\windows\

depending upon country you choose your ads will completely vanish

# Block YAHOO AD
127.0.0.1 au.adserver.yahoo.com
127.0.0.1 br.adserver.yahoo.com
127.0.0.1 ca.adserver.yahoo.com
127.0.0.1 cn.adserver.yahoo.com
127.0.0.1 de.adserver.yahoo.com
127.0.0.1 dk.adserver.yahoo.com
127.0.0.1 es.adserver.yahoo.com
127.0.0.1 europe.adserver.yahoo.com
127.0.0.1 fr.adserver.yahoo.com
127.0.0.1 hk.adserver.yahoo.com
127.0.0.1 in.adserver.yahoo.com
127.0.0.1 it.adserver.yahoo.com
127.0.0.1 launch.adserver.yahoo.com
127.0.0.1 mx.adserver.yahoo.com
127.0.0.1 nl.adserver.yahoo.com
127.0.0.1 no.adserver.yahoo.com
127.0.0.1 se.adserver.yahoo.com
127.0.0.1 sg.adserver.yahoo.com
127.0.0.1 tw.adserver.yahoo.com
127.0.0.1 uk.adserver.yahoo.com
127.0.0.1 us.adserver.yahoo.com
# YAHOO ADS Blocked

another site that i hate is blog-ads

# Block Blogads
127.0.0.1 web.blogads.com
127.0.0.1 st.blogads.com
127.0.0.1 img.blogads.com
# Blocked blogADs

Similarly to block Google Adsense Ads from non-premium adsense publishers,(which are light and dont steal much of my bandwidth) simply add following line to your hosts file:

# block google adsense publishers
127.0.0.1 pagead2.googlesyndication.com
127.0.0.1 www.googleadservices.com
# blocked google adsense publishers

You can also block Google analytics from tracking you

# block google analytics from tracking you
127.0.0.1 www.google-analytics.com
127.0.0.1 ssl.google-analytics.com
# blocked google analystics from tracking you


Finally i looked up my browser cache to find ads from some other sites so lets also block them for u

# block revenue.net ads
127.0.0.1 ads.kw.revenue.net
127.0.0.1 revenue.net

# block indiatimes ads
127.0.0.1 ads.indiatimes.com
127.0.0.1 adstil.indiatimes.com
127.0.0.1 adscontent.indiatimes.com

127.0.0.1 ad.yieldmanager.com
127.0.0.1 ads.cooltoad.com
127.0.0.1 ad.doubleclick.net
127.0.0.1 ads.ozonemedia.co.in
127.0.0.1 as.casalemedia.com
127.0.0.1 casalemedia.com
127.0.0.1 fastclick.net
127.0.0.1 a.tribalfusion.com
127.0.0.1 ads.yimg.com
127.0.0.1 imagec07.247realmedia.com
127.0.0.1 ad.in.doubleclick.net
127.0.0.1 oas.tech2.com/RealMedia/ads
127.0.0.1 adserver.yahoo.com
#127.0.0.1 www.googleadservices.com
127.0.0.1 www.google-analytics.com
#127.0.0.1 us.ard.yahoo.com
127.0.0.1 mi.adinterax.com
127.0.0.1 ssl.google-analytics.com
127.0.0.1 adserver.yahoo.com
127.0.0.1 in.adserver.yahoo.com
127.0.0.1 ads.clicksor.com
127.0.0.1 clicksor.com
127.0.0.1 popunder.adsrevenue.net
127.0.0.1 creative.clicksor.com
127.0.0.1 ads1.msn.com
127.0.0.1 adworks.rediff.com
#127.0.0.1 imads.rediff.com
#127.0.0.1 imadworks.rediff.com

End Note: use ad block with firefox to make life easier