Calls to users/lookup (https://api.twitter.com/1/users/lookup.json?screen_name=matevzg,demojzes&include_entities=true) is being search limited to 150 calls / hour, even when authenticated.
This has changed from normal 350 / hour.
Also, a couple of days ago search API 1.0 rate limiting headers started to return 350 all the time, no matter how many searches you perform, which is not an issue, but nevertheless.
We are moving to 1.1, but our code depends on the correct rate handling.