Tap hangs with Node 0.6

With Node v0.6.21, tap hangs for 30 seconds exactly and then exits with exit code `0` without any output:

```
node-tap $ bin/tap.js test/*.js
node-tap $ echo $?
0
```

Node 0.6 ships with Ubuntu 13.04 (if you don't add Chris Lea's PPA). Is Node 0.6 still worth supporting, or has everyone moved on by now?