I recently undertook a migration from oscommerce to ubercart. The scope of this migration was limited to the transfer of products (and categories) - I didn't try and migrate customers and previous orders.

There are several different PHP accelerators to choose from, but according to wikipedia "APC is quickly becoming the de-facto standard PHP caching mechanism as

There are several different PHP accelerators to choose from, but according to wikipedia "APC is quickly becoming the de-facto standard PHP caching mechanism as