News

CRM providers experience a 'freeze out' from the LinkedIn API - read more here
Advertising partners and content partners get preferred API access - article
Photosharing now available on iPhone app - article

Optimisation
Does it really matter? Its almost impossible to keep on top of profile optimisation but everyone should ensure that important keywords are found in the following sections;

Headline
Job title
Company name (edit display name)
Skills

Most importantly you should build a strong network so that most people that might search for you are at least a 2nd tier connection.
Tip
Find old school or college mates by searching the Alumni section
Question
What is a 'view' of an update on LinkedIn