You can use svn info or svn log. For example:
$ svn log -q --limit 1 http://svn.apache.org/repos/asf
------------------------------------------------------------------------
r1172722 | dkulp | 2011-09-19 13:29:02 -0400 (Mon, 19 Sep 2011)
------------------------------------------------------------------------
$ svn info http://svn.apache.org/repos/asf
Path: asf
URL: http://svn.apache.org/repos/asf
Repository Root: http://svn.apache.org/repos/asf
Repository UUID: 13f79535-47bb-0310-9956-ffa450edef68
Revision: 1172722
Node Kind: directory
Last Changed Author: dkulp
Last Changed Rev: 1172722
Last Changed Date: 2011-09-19 13:29:02 -0400 (Mon, 19 Sep 2011)
Both commands take an optional --xml option if you prefer XML output for parsing.