Heard it from a very reliable source today that these are the current limits for a Google adwords account:
- campaigns per account 100
- adgroups per campaign 10,000
- keywords per ad group (includes total keywords, negative keywords, ad group site exclusions) 5000
- keywords per account 1 million
- campaign negative keywords per campaign 10,000
- campaign negative placements (eg campaign site exclusions) 10,000
- placements per ad group 2000