Here's everything we took when we applied for my spousal visa:
form VAF2
Lola's passport
Richard's passport
2 passport photos of Lola
Lola's birth certificate
Richard's birth certificate
the marriage certificate
Richard's letter in support of Lola's application (stating he was aware of and supported her application)
copy of Richard's lease
letter from Richard's landlady granting Lola permission to live in the flat
letter from Richard's employer--stating his position, dates of employment, salary, and whether or not his position was permanent
one year of Richard's bank statements
three months of Lola's bank statements
Lola's CV, degrees, diplomas, etc., showing her employability in the UK
evidence of the relationship -- phone bills, photos, letter, a few emails
the application fee
Here's what they actually asked for:
the application form (VAF2)
our passports
a copy of Richard's lease
the letter from Richard's employer
our bank statements