The current situation at Fukushima is very different from the what happened at Chernobyl. When Chernobyl failed, the explosion exposed the bare core, and partially expelled it directly into the atmosphere (there was no containment structure like the reactors at Fukushima have). Additionally, the graphite used inside the core was flammable, which produced an open air fire releasing additional radioactive smoke.
At Fukushima, the only atmospheric release has been the steam from cooling water boiling off, and none of the cores are directly exposed. They are currently dealing with the opposite problem; instead of the radiation being released into the air, it's largely been collecting in all of the water they've been pumping through the reactors. This has the potential to contaminate the surrounding soil, ground water, and sea water, with one concern being the local fisheries which the region is so heavily dependent on.
In short, what's happening at Fukushima is defiantly a big deal and has the potential to get worse, but it's a much different problem then what happened at Chernobyl. As far as the map linked to above, I can't read what the units are so it doesn't provide me with any information. The 'intense' areas may be levels of concern, or only slightly above background levels. Based on the limited release directly into the atmosphere however, I would bet on the latter. The real problem is with all of the water currently under the reactors, not with what's in the sky.
Here is a handy chart to put exposure units into perspective. Of particular note is that spending one day at one of the highest measured sites outside of the plant (the measurements that made sensationalist headlines the middle of last month, but dissipated quickly) is comparable to a single mammogram. Again, I'm not saying what's happening at the plants is no big deal, but the effects are more localized then what happened at Chernobyl with fallout being a much lesser issue.
Radiation Dose Chart
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