ID and Calculated Column

If you find that you need to use the ID column to generate incremental invoice numbers and using a formal like =[ID]+1000

There is a problem check out Daisy Anands answer just here

http://community.bamboosolutions.com/blogs/bambooteamblog/archive/2008/04/24/calculated-fields-don-t-leave-home-without-them.aspx

The nub of the problem is that ID's aren't assigned till after the item is created, with the upshot that you'll need a tiny bit of workflow to put the invoice number in retrospectively.

Calculated columns, formulas etc

Sharepoint calculated column Common formulas list http://office.microsoft.com/en-us/sharepointtechnology/HA011609471033.aspx

You've tried [Today] and [Me] here are some more functions http://office.microsoft.com/en-us/sharepointtechnology/CH100650061033.aspx

Introduction to the subject http://office.microsoft.com/en-us/sharepointtechnology/HA101215881033.aspx

http://www.sharepointblogs.com/mkruger/archive/2007/06/26/howto-using-sharepoint-calculated-columns-to-display-a-list-item-as-quot-x-quot-days-old.aspx

C

Need to delete a content type but get the error "content in use" well you need to find where it is in use ... try this http://blog.tylerholmes.com/2008/02/deleting-content-types-in-sharepoint.html

CAML query builder so useful http://www.u2u.info/SharePoint/U2U%20Community%20Tools/Forms/AllItems.aspx developed by Patrick Tisseghem