Just had to share this diagram of common inline skate injuries via Kyle Sola's blog which documents his design process while a Pratt ID student.
Retroflective adhesive vinyl is a wonderful thing. The kits come in two types: Caterpillar and Pinstripes.
The Caterpillar has 1 inch bands that wrap around the main tubes, and in inch dashed lines along the fork and seat stays. The Pinstripe has 1/4 inch strips that run along the outside faces of all tubes.
Each kit is sized to be large enough for a 61cm frame with extra wide tubing, so in nearly every case, you will have extra materials that will give you room to play and experiment.
If all-out safety/DayGlo/fluorescent is not your thing... 
In visual perception, change blindness is the phenomenon that occurs when a person viewing a visual scene apparently fails to detect large changes in the scene. For change blindness to occur, the change in the scene typically has to coincide with some visual disruption such as a saccade (eye movement) or a brief obscuration of the observed scene or image. - via Wiki
Shared Space relies on environmental context--in this case, a landscape unlittered by signs--to influence human behavior. "Our behavior in a theatre or a church differs from a pub or in a football stadium as we understand the signs and signals through years of cultural immersion," Monderman told an interviewer in 2006. "Likewise if we see children playing in the street, we are more likely to slow down than if we saw a sign saying 'Danger, Children!'" - via Worldchanging
3M reflective self adhesive vinyl for your bike -- in all types of shapes including that great heart cog. 
How not to get doored.
Most car doors can swing open four feet, so consider 48 inches the safe distance. Since most city bike lanes are only 36 inches wide, ride on the outside of the lane, or take up a lane of traffic, which is your legal right.
Get your signal on. Designed to facilitate communication and create dialogue between bicyclists & automobiles. 100% organic cotton long sleeve t-shirt. Screen-printed with fluorescent green plastisol-free ink. Typographic illustration by Mary Banas.+ Eloi Collective donates 5% of sales to LivableStreets, a non-profit organization that challenges people to think differently about urban transportation and to demand a system that balances transit, walking, and biking with automobiles.
Part of Kanye West's Nike Shoe Collection. Designed for the club culture but so nice for an evening bike ride - perhaps even more so coming home from a club. 
Catlike Whisper Plus with the most beautiful vents (from Spain)
Fahrer little clutch which can be mounted in a number of ways onto your frame (from Germany)
During EUROBIKE 2009, which took place in Germany earlier this month, Dahon unveiled their Pango helmet. Once FOLDED (!) the helmet takes up half the space of a regular one becoming insanely compact. Here's the video showing how easily it folds.
Built-in added safety. So smart. Shouldn't every tire come with reflective beading? These Continental Contact Reflex are reliable for the city - but other companies like Vittoria make similar ones.
The Slow Bicycle Movement is a celebration of the bicycle. Not as a speed machine or a tool for tribal membership but merely as an enjoyable way to get around.
It's about the journey, not the destination. The destination is, invariably, a fixed geographical point which isn't going anywhere... [okay, sure, the tectonic plates are in constant movement but they are thankfully even slower than us]... so you're going to get there eventually and anyway.
It's about riding your bicycle. To work, to play. Casually, in a relaxed manner. With time to enjoy the self-propelled movement that you and you alone generate. And, of course, to look around and see the landscape - urban or not - that you pass by at your leisurely pace.
Who Causes Cyclists’ Deaths?
More than 52,000 bicyclists have been killed in bicycle traffic accidents in the U.S. over the 80 years the federal government has been keeping records. When it comes to sharing the road with cars, many people seem to assume that such accidents are usually the cyclist’s fault — a result of reckless or aggressive riding. But an analysis of police reports on 2,752 bike-car accidents in Toronto found that clumsy or inattentive driving by motorists was the cause of 90 percent of these crashes. Among the leading causes: running a stop sign or traffic light, turning into a cyclist’s path, or opening a door on a biker. This shouldn’t come as too big a surprise: motorists cause roughly 75 percent of motorcycle crashes too.
