I couldn't find a 2.0 blocker bug, so here it is.
SnmpMonitor / SnmpPlugin "walk" parameter not working correctly
Deleting Custom Poller Does Not Clear Services Table
Document XML export of RRD data
Tracking ticket for OpenNMS 1.8.0 (the "Fix Capsd" release)
spring/beanfactory issue in icedtea (java 1.7.0 dev)
Update outage model to include location
SNMP Trap Configuration Editor
Need switch traffic report
"Poll node" action for the web gui
User configurable time period for web page availability
Support for CIFS and NFS monitoring
Umbrella Bug for Path Outage
Sort-order of the pulldown menus containing nodes
Request: Express Time Values as a String in Configuration Files
Node List By Category
Admin section of discovery doesn't allow to edit existing ranges.
Time period dropdown does not exist in dashboard view
Getting threshold forecasts
Allow for multiple node labels per node
Timeline view of events
Proposal of "Containers" for named filters / include-exclude ranges etc.
Provide NOT functionality for the resource-filter in thresholding.
email statsd reports
Monitoring of Webservices
Add Trap OID to Event / Alarm detail display
Manage VLAN interface groups
Add filtering capability to Outages web interface
OutageModel - does not consider Categories
Reporting Scheduler and Addition of Emailing Performance Reports
Add the [-] option to the notifications page.
Export Reports to CSV
Dashboard: Configurable refresh & clickable node labels
No link back to node after manually unmanaging services
Move oncall schedule to navbar and notifications to header
preventing events from getting lost
"acknowledged outage" feature
Adding "space navigation"
Availability report time periods
Adding a Layer 2 Polling Feature
Layer 2 Device Tracking Feature
The ability to reread certain configuration files
Asset DB improvement
User-configurable Asset Categories
Display duty schedules