Once you've already searched on a given topic, you can Save the RSS feed of this Search. When you Subscribe to this feed you can access it anytime from your browser favorites or can read it from your preferred RSS feed reader like iGoogle or netvibes.
3. Be notified about Feed activity
I know even checking the RSS feed is a reactive way of keeping up with things. Well how can we reduce our time-to-hunt further?
With cool Social tools like ifttt.com (Yes "spelt like a 'Lift' without the L" you can design your response mechanism to fire you an email, for e.g. or have your send a Tweet from your Twitter account, whenever there is a new item on your Search feed, which means on any new activity on topics of your interest.