Are you referring to 'seeing' what backlinks your site has? or something that checks to see if your backlinks are still present on the page?

Who links to you or number of back links?

For number of backlinks, I use the free digital point tool

do a search for digital point keyword ranking

I like Backlink Watch the best too but it seems to exceed its usage limits a lot. Still, it's not like I want to check every day so I may just wait till the next day or something if I can't get it to work on one day.

Yahoo site explorer will shows all of your backlinks, I have been using that for a long time, And yeah it's working fine for me. . Thank you

I always use backlinkwatch too but its really difficult to get through. Its not really that bad though since its free. You can try Iweebtools its quite good too.

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Its good to keep checking your backlinks. To take care of their present status, if they are still on the page for which you have exchanged a link or paid. And if you have paid for a link(which is not a good thing to do in eyes of Google) it becomes a necessary practice for you to take care of your links, after all you have paid for it.

But what else are the reasons you check your backlinks?

For example
1.you can check to keep an eye on your competitor activities.
2.or you can also check it to get an estimate of the time frame it may take to get your site rank on search engines.

What else is the reason you check your backlinks?

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Backlink watch is good but i always prefer yahoo site explorer and use seoquake with it to check the pr of the backlinks

I use single command on various search engines to check the backlinks and that is
link:yoursite.com .

I'm using backlink hunter to check my backlinks.

I used backlinkwatch and backlinkhunter in order for me to check my backlinks for my blog.

I'm using yahoo's site explorer to check my websites backlinks. Seems pretty accurate.

search status for mozilla works pretty well

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I am using Yahoo site explorer since i start seo, and it works just fine for me.

i still using alexa tollbar and the backlink will show at the alexa links

Open site explore is also the good one...

I use Yahoo Site Explorer, since Google Webmaster doesn't show much if any backlinks that I have. Also, I use SEO For Firefox plugin to check for PR, etc.

I find backlink watch to be the most accurate. I too love numbers and stats and find myself checking backlink numbers on a daily basis.