Say I have a tech blog, how best would I store technical specs for a phone, if i use custom post types

i would go with custom post types with custom fields for each type. This will allow you or your client a super simple way to add, edit, delete, etc fields of each phone or the phone in general from your WP install.

If you don’t feel like programming it, i have used a couple plugins
1. for defining custom types
http://wordpress.org/extend/plugins/more-types/
2. for adding custom fields to not only the custom type you created but also posts, pages, etc.
http://wordpress.org/extend/plugins/more-fields/

Once you are set up it would not be hard to compare or search the fields to do what you need with the compare and/or search. Some simple custom programming would be needed.

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