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Collection of 2007's best Gadgets, Goods and Gizmos More Rooms for Roomba One of iRobot's newest robotic vacuums cleans four rooms and finds its way back to its recharger. Radio and infrared transmitters at doorways tell it which rooms it has yet to clean and which to cross to get home. iRobot Roomba 560 $350; roomba.com See More Spot underwater features, whether trout or sunken treasure, in greater detail. An 800-kilohertz sonar wave-a higher frequency than in other consumer devices-creates near-photo-like images. Humminbird 997c SI Combo $2,000; humminbird.com Small Packages Is your living environment, shall we say, spatially challenged? Barely larger than most microwaves, the Mini Kitchen still manages to squeeze in an oven spacious enough for a whole chicken or pan of brownies along with two hot plates powerful enough for all your toasting needs. Best of all, it´s self-cleaning, eliminating the need for passive-aggressive reminders to your roomma...