Instead of picking a cell immediately adjacent to the table, leave a blank column for your auto sum. Alternatively, after entering the auto sum and generating all the #ref errors in the cells above and below, then press ctrl-z to get the one formula you need. You can clear the table formatting with a single mouse click on the home tab (Clear Formatting). You can create a default style for tables with no banding or header/footer highlighting and make it the default style using "Format as table | New Table Style". You can also remove all the table attributes (the column filters and total rows) by right mouse clicking in the table and selecting "Table | Convert to range".
In Word, you can "Paste special" to paste the plain text rather than the formatted rows (although I like the shading in the document). I'd recommend removing the formatting in Excel before the copy though as the operation is faster.
Because you only "sometimes" want the table attributes, and tables allow instant filtering and summing of values, as well as two click generation of bar and pie charts from the data, we still consider that overall they're a benefit.
PS - Of course, if you continue to run Excel 2003, then we don't generate tables. <g>
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Andrew Bates