From Eclipsepedia

Existing:

• Trunk -- ongoing development
• M0-8 -- at the end 1.0M8
• B1-0M9 -- at the end of 1.0M9
• B-1-0-0 -- Higgins 1.0.0 release (2008-2-21) [Branch off of trunk]

Planned:

• T1-0-1 ---- Higgins 1.0.1 release [Tagged version on B1-0-0 branch]
• T1-0-2 ---- Higgins 1.0.2 release [Tagged version on B1-0-0 branch]
• B-1-1M1 ---- Higgins 1.1M1 [Branch off of trunk]
• B-1-1M2 ---- Higgins 1.2M2 [Branch off of trunk]

Graphically:

 |
 +-- B1-0M9 ---
 |                 T-1-0-1    T-1-0-2
 |                 /        /
 +-- B-1-0-0 ------+--------+                               
 |
 |
 +-- B-1-1M1 ---
 |
 | 
 +-- B-1-1M2 ---
 |
 |
 |
trunk