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Distribution at install time.

+-----------------+---------+
| Distribution    | Percent |
+-----------------+---------+
| DEBIAN LENNY    |    34.8 | 
| UBUNTU HARDY    |    18.5 | 
| DEBIAN ETCH     |    15.2 | 
| CENTOS 5        |     7.6 | 
| UNKNOWN         |     5.6 | 
| UBUNTU LUCID    |     4.0 | 
| DEBIAN SQUEEZE  |     3.3 | 
| GENTOO          |     2.3 | 
| UBUNTU FEISTY   |     2.3 | 
| UBUNTU INTREPID |     2.3 | 
| UBUNTU DAPPER   |     2.0 | 
| UBUNTU GUTSY    |     1.7 | 
| DEBIAN SID      |     0.3 | 
+-----------------+---------+

Customer may have changed it since (especially likely for Ubuntu Hardy).

Didn't record this to begin with, hence some UNKNOWN. I'll probably add a form to the panel site so people can self-update.

Might be interesting to track changes over time.