Here is a great example of why you really need to install this plugin: Within an hour of installing this plugin, I received 83 notices of 404 errors – that’s 83 missed opportunities to reach visitors!!! And that was only the first hour, I was away from my computer for the weekend and when I return, there were 372 File Not Found (404) errors!
It seems the problem was all of the StumbleUpon traffic for my Royale Noir: A Secret XP Theme Uncovered post: I recently changed the post slug – I wrote a redirect in my .htaccess file but I missed something! Also, I have been editing all of my tags and restructured my permalinks recently, and it turns out that I had to rewrite quite a few links from my past 383 posts!
Why You Should Install This Plugin
I think this plugin should be mandatory! It will help you fix errors that have developed over time, and help your site retain it’s professional look – no visitor will try too hard to look for missing content on your site, they’ll just Google for another site that will have the information they’re looking for! 
404 Notifier Options
You can have the plugin print a special RSS feed or send you an email!
Tips
Another great use (for me) is: I manage quite a few blogs out there, and I installed this plugin on all of the and had them all send emails to the same address – that way, I only have to check one place for all of my sites (instead of checking a ton of feeds).
Download The 404 Notifier Plugin
404 Notifier (look for the “Download” button on the right sidebar)
What Is A 404 Error?
A File Not Found (404) Error means that, while your browser was able to access the site, the file (or dynamic URL) you where trying to access was not found. This could be in the form of broken links, deleted files, typo’s, etc. – basically, your visitors are missing out on the information they where looking for! More information on 404 Errors.
Wow.. now this is a pretty sweet plug-in.. I gotta check this one out
And it functional too!
One thing that I’ve noticed is that it counts redirects as 404 errors…
Hmmm… I think tonight I will install it on my blog(s)
Thanks Saman
Your post frequency has come down what happened?
School happened, I just started taking online classes at the University of Phoenix!
Thats exactly why I couldn’t keep posting every day. Well some months before I used to bunk classes to Blog. but now its hard..
Well it is only now that i have read your get a link page. You are really good to us Saman
I will be installing this one. Thx. I am a nit picker.
This is a great way to capture more viewers.
A very useful plugin indeed. Thanks!
Thanks for this!
I think after Akismet – the spam blocker, this is another great addon!
Thanks again.
Harris
what are your other blogs, Saman
I’ve had this installed a long time and and times it has been a near life saver, I kept getting weird 404s on my admin pages, turns out someone was trying to hack it! Never would have known without this plugin!
Of course, reducing broken links helps with a lot too, like google search ranking and page rank (start crazy debate with people talking rubbish like that last statement)
Hello,
this is nice plug-in, unfortunately I’m not able to use email functionality, because of my hoster’s email restrictions. After disabling email, there is no new entries in rss feed, it shows always 1 entry. Tell me, how can get (see) the entries.
I didn’t write this plugin, I suggest you ask the author.
Good to know. Thanks for the info on this plugin. I think I need to get it myself. Google hates 404 errors don’t they?
Yeah, it’s not good for SEO!
Very nice plugin, I just changed my permalink structure twice and I fear there are still 404 errors being thrown.
This plugin helps a lot to monitor it!
To start earning money with your blog, initially use Google Adsense but gradually as your traffic increases, keep adding more and more money making programs to your site.