Example tags from an issues list on Google Code

issue-tags.txt

Efdhack-2012         = Suitable Issue for a 2012 hackday
Estimate-Hours       = A developer estimates that this issue will take a few hours (or less) to resolve
Estimate-Days        = A developer estimates that this issue will take a few days (or less) to resolve
Estimate-Weeks       = A developer estimates that this issue will take a few weeks (or less) to resolve
Estimate-Months      = A developer estimates that this issue will take a few months (or less) to resolve
Type-Defect          = Report of a software defect
Type-Enhancement     = Request for enhancement
Type-Task            = Work item that doesn't change the code or docs
Type-Review          = Request for a source code review
Type-Other           = Some other kind of issue
Priority-Critical    = Must resolve in the specified milestone
Priority-High        = Strongly want to resolve in the specified milestone
Priority-Medium      = Normal priority
Priority-Low         = Might slip to later milestone
OpSys-All            = Affects all operating systems
OpSys-Windows        = Affects Windows users
OpSys-Linux          = Affects Linux users
OpSys-OSX            = Affects Mac OS X users
Milestone-Release1.0 = All essential functionality working
Milestone-Release1.1 = All essential functionality working
Milestone-QualityRelease = 1.5.1  with testing and quality framework
Component-UI         = Issue relates to program UI
Component-Logic      = Issue relates to application logic
Component-Persistence = Issue relates to data storage components
Component-Scripts    = Utility and installation scripts
Component-Docs       = Issue relates to end-user documentation
Component-Tests      = Issue relates to unit or other testing
Security             = Security risk to users
Performance          = Performance issue
Usability            = Affects program usability
Maintainability      = Hinders future changes

Issue statuses can be OPEN or CLOSED.

OPEN status types:

New = Issue has not had initial review yet
Accepted = Problem reproduced / Need acknowledged
Started = Work on this issue has begun
Suspended = Work has started but is curently suspended
Fixed = Developer made source code changes, QA should verify

CLOSED status types:

Verified = QA has verified that the fix worked
Invalid = This was not a valid issue report
Duplicate = This report duplicates an existing issue
WontFix = We decided to not take action on this issue
Done = The requested non-coding task was completed

...and DUPLICATE is handled separately, so that comments can be merged into one issue.