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We use tags for small release releases and release branches. For example,
v1.0 <-- Branch
v1.0.1 <-- Tag
v1.0.2 <-- Tag
v1.1 <-- Branch
v1.1.1 <-- Tag
v1.1.2 <-- Tag
v1.2 <-- Branch
v1.2.1 <-- Tag
v1.2.2 <-- Tag
v1.3 <-- Branch
v1.3.1 <-- Tag
v1.3.2 <-- Tag
v1.4 <-- Branch
v1.4.1 <-- Tag
v1.4.2 <-- Tag
v1.5 <-- Branch
v1.5.1 <-- Tag
v1.5.2 <-- Tag
To use the Microsoft analogy, Branch is the Windows edition (95, XP, Vista, etc.), and the tag is the service pack.
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