Would you like to use labels defined in Languages in your product full description? Something like this: "This shoes are for $lbl.running", and $lbl.running = "Running". Changing the label content you will change in all products this label.
Here is the solution:
find skin/common_files/customer/main/product_details.tpl
replace line 18
Code:
<td class="descr">{$product.fulldescr|default:$product.descr}</td>
with
Code:
<td class="descr">{eval var=$product.fulldescr|default:$product.descr}</td>
Of course you can run an SQL query if you are smart enough
