How to say 'I love you..'

How many ways can you say I love you?

For some French influence in your love life...
'Je t'aime' (basic for I love you)
or 'Je t'adorer' (to adore you)

For some geisha lovin'..
Ai shite ru means I love you in Japanese. However, this phrase is very rarely used and has very different connotations in Japan than in the West.
Dai suki means I really like you (and sometimes translate as 'I love you')
For more info, click here.

For those Pinoy and Pinay lovers out there..
Mahal kita; basic I love you phrase.
Mahal means 'a lot', kita, oddly enough can also mean 'earnings' or 'salary. Mahal can also be used as a term of endearment to someone 'close to your heart'.
Iniibig kita also means 'i desire you'.
To say 'mahal na mahal kita' also means 'I love you a lot.'
Minamahal kita means 'I'm in love with you'.
Mahal mo ba ako? Do you love me?
Lab kita? (slang) "lab" being the Filipino pronunciation of love.
Gusto na kitang pakasalan; I want to marry you
Gusto kitang makasama habang buhay: I want to spend the rest of my life with you.
Tatanggapin mo ba ang alay kong pakasalan kita? Will you marry me?
Ikaw lamang ang aking iibigin magpakilanman; You are the only one I will love forever.
Ang pag-ibig ko sa iyo ay tunay. I love you truly.

see source for more romantic Tagalog phrases.
source: http://www.seasite.niu.edu/Tagalog/Tagalog_Homepage99/tagalog_romantic_phrases.htm

For more ways on how to say I love you in 100 languages, see this page for more.