Tags in SVN indicate a development state, a moment in time. Here you find a list of GRASS releases tagged in SVN. If you want to download GRASS with defined status, you may use the "tags" denoted here:

GRASS 6.3.x testing release tags

Release branch: "releasebranch_6_3"

GRASS 6.3.0: has been tagged as "release_20080423_grass_6_3_0_1" (23 Apr 2008)
GRASS 6.3.0RC6: has been tagged as "release_20080321_grass_6_3_0RC6" (21 Mar 2008)
GRASS 6.3.0RC5: has been tagged as "release_20080219_grass_6_3_0RC5" (19 Feb 2008)
GRASS 6.3.0RC4: has been tagged as "release_20080109_grass_6_3_0RC4" (9 Jan 2008)
GRASS 6.3.0RC3: has been tagged as "release_20071130_grass_6_3_0RC3" (30 Nov 2007)
GRASS 6.3.0RC2: has been tagged as "release_20071120_grass_6_3_0RC2" (20 Nov 2007)
GRASS 6.3.0RC1: has been tagged as "release_20071024_grass_6_3_0RC1" (24 Oct 2007)

GRASS 6.2.x stable release tags

Release branch: "releasebranch_6_2"

GRASS 6.2.3: has been tagged as "release_20071127_grass_6_2_3" (27 Nov 2007)
GRASS 6.2.3RC1: has been tagged as "release_20071021_grass_6_2_3" (21 Oct 2007)
GRASS 6.2.2: has been tagged as "release_20070716_grass_6_2_2" (16 June 2007)
For older tags, see SVN-tags

GRASS 5.4.x stable branch

5.4.x Release Tags

GRASS 5.4.1: has been tagged as "release_20070726_grass_5_4_1"
GRASS 5.4.0: has been tagged as "release_20041105_grass_5_4_0"
For older tags, see SVN-tags

Last change: $Date: 2008-08-20 23:50:46 -0700 (Wed, 20 Aug 2008) $
$Author: hamish $