The last stable release is from a while back: 1.0rc2 (dated Oct 25, 2005). A little while after it was released though, it was decided that there were enough shortcomings in that version which would practically lead us to a crippled version bearing the milestone number 1.0.
At that time, we decided to take the plunge and started re-designing some of the core modules, re-factoring some others and generally increasing the development pace. Soon after, new features started creeping in as well as new bugs (an inevitable fact of programming).
Anyway, to make the long story short, time has gone by and no new release was made. Well, not quite...
Since January the 2nd of 2006, we started publishing what we call "nightly builds". These are development (binary) snapshots containing Code::Blocks in its current form, updated each day (well, actually each night). These binary snapshots allow people to watch Code::Blocks evolve without them having to build it from source. This was a huge help to us, because we got almost immediate feedback about bugs that crept in, usability issues, anything. And so Code::Blocks evolved in ways we had not imagined...
Note though, that the fact that nightly builds are "development" snapshots, doesn't make them immediately unusable. As a matter of fact, any recent snapshot is much more stable than our last "stable" release (so called 1.0rc2). In terms of features any snapshot is leaps ahead 1.0rc2.