Worry loss traffic from Search Engine after change the permalink structure?
Here my experience and solution…
Since I start to blog iCalvyn.com, my blogging platform (Wordpress) are install in http://blog.iCalvyn.com which is a subdomain. Any one who access www.iCalvyn.com will be redirect to http://blog.iCalvyn.com (subdomain)
After few month hardwork on traffic marketing and link building, google have rank me PR3, this both domain iCalvyn.com and blog.iCalvyn.com. Half year later, when google make another rank, my main URL www.iCalvyn.com maintain PR3 while my subdomain http://blog.iCalvyn.com become PR0… what a sad story…
I keep on asking google reconsider ranking my website, and few month back google just give me a PR2 for my subdomain, main URL still maintain PR3. I still not happy on this, I deserve to get higher PR.
For this case, I was planning to migrate my blog from the sub domain to the main URL, but I worry on the traffic from search engine(SE) will be loss. Example traffic from SE access http://blog.icalvyn.com/hello-world will be no longer exist after I change.
Permalink Moved Permanently
With using “Permalink moved permanently” plugin from Microkid, will solve your problem while you change permalink structure.
Example (1) for your current permalink
http://www.yourname.com/2008/04/hello-worldExample (2) for your after change permalink
http://www.yourname.com/hello-world
You won’t loss the traffic which access Example (1) URL after installing this plugin. People who access your old URL (from forum or other people who link your article) will redirect to your after change URL at Example (2)
Back to my case…
I am not actually change my permalink, is only domain structure, I am also not sure would this plugin helps or not. The reason make me take action is because I realize that my main URL now was PR4.
After few hour troubleshoots, I realize that I still need to maintain my own blog at subdomain, if the blog does not exist, the link can’t works, still need to check with microkid.
Any way, I have success migrate my blog from subdomain to the main URL. Huray~ 
My name is Calvyn,from PENANG, an IT Engineer, Malaysia LIFE tech blogger. I am an IT Engineer who blog about my LIFE working Experience, such as Technology, Computing, Networking and also my hobbies, Photography.
By imDavidLee on Jun 11, 2008 | Reply
now i only realise that change permalink structure oso can cause lost traffic one..
By calvyn on Jun 11, 2008 | Reply
David >
Yes, loss traffic especially from the search engine. You just change ur permalink structure rite, should use this plugin
By Mitz on Jun 11, 2008 | Reply
how bout the other file which attach in your blog?
By Ronald Su on Jun 12, 2008 | Reply
Some people spend too much time improving and fixing their SEO and PRs instead of providing quality and fun content.
It is difficult to find a balance for bloggers and webmasters.
By exinco on Jun 13, 2008 | Reply
hi calvin,
how to ‘request’ pr from google. can you share with me. i read it before but lost it.
without PR susah cari makan he..he..
By calvyn on Jun 13, 2008 | Reply
exinco >
We unable to request PR from google, but we can ask goole to reconsider giving us PR. some thing like appeal for the ranking.
Just do it over google webmaster tools, you can apply for the reconsider there
By Jayce on Jun 13, 2008 | Reply
Cool… Your site have PR4 now.
By Pin on Jun 14, 2008 | Reply
Try Redirect 301. We used to define one offical URL and those pointing URL are using 301. This means your PR will be combined and less confusing for search engines.
Since you have migrate to main URL. I would suggest you to update your httpd.conf to add the 301 pointing of blog.icaxxx to icaxxx.com
By calvyn on Jun 15, 2008 | Reply
Pin >
I have try 301 redirect previously from iCalvyn.com to blog.icalvyn.com but the PR did not same.
iCalvyn.com (Pr4) and blog.icalvyn.com(Pr2) only… google have change algorithm i guess
By exinco on Jun 15, 2008 | Reply
i look at webmaster tool for consideration, but no idea what to write. Can you suggest a sample
thanks.