Econintersect: Home prices, not seasonally adjusted – have began their annual spring surge according to Altos Research. They state that week-over-week data is beginning to show signs of improvement, indicating a good start to what is, typically, the strongest sales period of the calendar year.
Altos Research explains that the headline pricing metric 90-day rolling average still shows monthly declines. Case-Shiller home price uses a 3 month average in its reporting but their data lags several months, while Altos Research data covers the same 20 city area and is current up to March.
Econintersect continuously analyzes housing data in its economic analysis blog (see thread here).
And as an aside, active supply is up ever so slightly on a year-over-year basis: