If this is your first install, automatically load on login with:
mkdir -p ~/Library/LaunchAgents
cp /usr/local/Cellar/couchdb/1.0.2/Library/LaunchDaemons/org.apache.couchdb.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/org.apache.couchdb.plist
If this is an upgrade and you already have the org.apache.couchdb.plist loaded:
launchctl unload -w ~/Library/LaunchAgents/org.apache.couchdb.plist
cp /usr/local/Cellar/couchdb/1.0.2/Library/LaunchDaemons/org.apache.couchdb.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/org.apache.couchdb.plist
Or start manually with:
couchdb