Additional Card Type: Items i.e. Hardware
Add an additional card type called Serial Number that could be used to track varies items. This is especially useful for computer hardware. Fields should include: Item Name, Brand, Serial Number, Model Number, Purchase Location, Purchase Date, Other Info, URL, Warranty, Phone Number for Support, Registered Name. Plus the ability to add ad hoc fields.

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Anonymous commented
As commented in another post, it would be better if they allowed us to create "templates" with custom fields. So we can design a template we need (like the one you are suggesting) and reuse it.
Instead of they providing default templates (which are nice, they could even provide more such as templates for bank accounts and rewards - all with the ability to add custom fields) but it would be awesome if a user could just create their own template to store whatever they need, in the form they prefer.
By the way, notes should be part of every template (like a field you could add or not depending on your needs).