Objective-C has held it's position with 941 jobs in March (up from 837 in February). Android was this months loser though dropping from 4th to 5th position, behind SQL. Objective-C still looks set to challenge either PHP or Java for one of those top two positions but Android jobs don't seen to have the momentum at the moment. Lower down the table there was little movement this month with C and C++ moving above ASP.net and Python respectively.
There has been a gradual decline in jobs being advertised since January, with February and March bringing in 500 less than were advertised in the previous month. Hopefully we continue to see a strong developer jobs market for the rest of 2012.
The data for the above is taken from developer jobs found on twitter by Jobs Tractor. If you're a developer looking for work you might want to check out the Jobs Tractor developer jobs board.
If you'd like to keep track of these trends, or see some of the interesting stats within the data set then follow the Jobs Tractor blog where I'll announce new releases of these stats and the other interesting things I find in the data.