The gradual decline in jobs being advertised since January continues although possibly the April figures were affected by Easter. We'll have to see if numbers recover next month or continue the trend.
Apart from that April saw very little change in the rankings. Java and PHP traded places again and Objective-C continued to be a strong 3rd place. held it's position with 941 jobs in April (up from 837 in February). Android was this months loser though dropping from 4th to 5th position, behind SQL.
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.