Ok, firstly this is not about forms this is about consistent layout as a user explores a site.

let me explain:

If we imagine a (non-ajax) digital camera online store, say someone was on the DSLR section and specified to view the cameras in Gallery mode and order by price. They then click onto the Compact camera's page. It would be in the users interests if the 'views' they selected we're carried over to this new page.

Now, i'd say use a session - am i wrong?

are there performance issues i should be aware of for a few small session vars ( ie view=1 , orderby=price) ?