ernie, just be sure to book your next cruise through a travel agent versus direct :P won't cost you anything more, and you may get a free upgrade or two!
In regards to Status with NW/CO/HP: The partners have all not agreed in unison to carry your benefits over to 2002 *yet* and this is essential for it to happen program wide.
Incremental mileage will allow you to pay for part of your airline ticket with miles and cash, but on a larger scale than offered in July / August by TWA, American, & Northwest. (I think Delta did this too).
But so far, United has given us many hints it will carry Premier, Premier Exec, and 1K status over to 2002 unless you've already met Premier status... 1K comp upgrades are gone though (oh well).
TWA Advantage Elite members will not be given status with American Advantage UNLESS they've earned it for 2002. :/
-nate