Oh the frustration of breaking the lead on your automatic pencil. There you are, in the zone, when snap!, and you lose your train of thought. Mindful of your very real first world problems, Japanese company Zebra Co. designed the DelGuard pencil, which features a pretty sophisticated system of shock absorbers and retractable shields used specifically for preventing the lead from breaking. One spring takes care of vertical pressure by retracting the lead, while the other senses diagonal pressure and extends a lead-proteting shield. Combined, they should save you at least seconds of frustration.
The DelGuard pencils come out November 12 in Japan, and will sell for about 450 Yen (about $4).