Unable to create My Site in sharepoint
If you can’t create your my site in sharepoint and you are the admin, check the self service creation in the central administration
It can save you a lot of time.
You need to enable self service creation. To do so:
-Click Start -> All Programs -> Administrative Tools -> SharePoint Central Administration.
-Go to Virtual Server Configuration, click Configure virtual server settings.
-Click virtual server to enable on the virtual server page.
-Under Automated Web Site Collection Management, click on Configure Self-Service Site Creation.
- Then select On in the Enable Self-Service Site Creation section
Also, if you are deploying for the extranet you might consider hosting the sites under port 80 instead of the default 82. Check out this post by Chris Johnson on how to move your sites to port 80. http://blogs.msdn.com/cjohnson/archive/2006/09/15/754902.aspx. One note on this steps, please remember to browse to the newly create site for the my site host and click on “set as my site host”. And don’t forget to apply theme and master page.
If you are having trouble accessing your sites from the outside, also check the My Site trusted locations and finally don’t forget about the alternate access mappings.
Well… so many things required to set up my sites to work properly in SharePoint 2007….

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Jeffrey,
I will be glad to contribute. Just drop me a note and tell how I can help.