sumimasen - Pardon me/excuse me
ohayou gozaimasu (o-ha-yo) - Good morning (Less formal: just "ohayou")
konnichi WA (koh-n-nee-chee-WA) - Good day (afternoon used after 11 am)
kon ban WA (koh-n ban wah) - Good evening
ii otenki desu ne (ee oh-ten-kee deh-soo neh) - Nice weather, isn't it?
iiyana otenki desu ne (ee yah-nah oh-ten-kee deh-soo neh) - Bad weather, isn't it?
ii desu (ee deh-ss) - It's fine
ii desu ka? (ee deh-ss kah?) - Is it ok?
baka (bah-kah) - Anything from silly, to stupid, to "f---ing idiot!" depending on how harsh your tone is.
kisama (kee-sah-mah) - Curse word; similar to "bastard"
hai (hi) - yes
iie (ee-eh) - no
asa gohan (ah-sah goh-han) - breakfast
hiro gohan (hee-roh goh-han) - lunch
ban gohan (ban goh-han) - supper
oyasumi nasai (oy-ah-soo-mee nah-s-eye) - good night
ai shiteru (eye-ee shee-the-roo) - I love you
domo arigatou gozaimasu (ari-got-ou go-za-ee-mass) - thank you very much (Less formal: "arigatou")
onegai shimasu or kudasai (oh-neh-guy-shi-mass or koo-dah-sigh) - please
kawaii (ka-why-ee) - cute
ittekimasu (ee-the-kee-mah-ss) - I'm leaving. Used when you're planning on coming back soon.
itterashai (ee-the-rah-shy) - Come back soon. Standard reply to "ittekimasu"
itadakimasu (ee-tah-dah-kee-mah-ss) - "I'll have some then"; usually said just before you start a meal, similar to saying "bon-apetit" or grace.
ja mata ne - See you later.
ja mata ashita - See you tomorrow.
I don't know if this is all spelled right, but here are some neat links.
Common Japanese phrases
www.jref.com/language/japanese_common_phrases.shtml
www.appliedlanguage.com/languages/Japanese/japanese_phrases.shtml
www.ob.otakufridge.com/lofiversion/index.php/t2699.HTML
I also suggest any language products by Pimsleur (example- cds, maps, dictionaries, etc) sold by Barnes and Nobles as well as any other major book store / internet
http://search.barnesandnoble.com/booksearch/results.asp?WRD=pimsleur+Japanese&z=y
Hope this helps ^_^