Polysemous disyllabic words
How about 利害 and 结果 and 东西？

利害（都四声）,both 4th tone pros and cons
利（四声4th）害（轻声neutral tone） , terrible (and confusingly also great)
结果jie1guo3 bear fruit
结果jie2guo3 outcome
东西dong1xi1 east and west
东西dong1xi thing
精神jing1shen2 spirit mind (this word just came up in my text)
精神jing1shen vigour, vitality 

Homonyms with the same meanings look here:

http://www.zybang.com/question/51d637d5aad5d84a6c3e45a3c746458a.html

This is about single characters:

http://www.zybang.com/question/655a87060b4ee9784787d4bf9231b3ba.html

Question: 字相同,读音不同,意思不同, Character the same, tone different, meaning not the same

Answer: 很多啊 和字 有五个读音 意思都有所不同 比如,我和他 he 是连词 麻将和了是动词 读hu 和面 读huo 是动词 等等

Translate for you,

很多啊 
There are a lot
'和'字 有五个读音 
the character '和' has 5 different pronunciations
意思都有所不同 
each has its own different meaning
比如,我'和'他 'he' 是连词 
for example, I 'and' he '和' is a conjunction read he
麻将'和'了是动词 读hu 
Mahjong '和' is a verb read 'hu'
'和'面 读'huo' 是动词 等等
'和' bread, read 'huo' is a verb etc.

This link is for words with the same sound, but different characters.(I know, not what your asking for, thought it was interesting!)

http://www.zybang.com/question/51d637d5aad5d84a6c3e45a3c746458a.html

You can see, I don't have a lot to do this morning!

PS I think 'differentely' is spelt differently. Vive la difference!