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It's fine to drive with the CEL (assuming it's not flashing).
The SAI (Secondary Air Injection) system faults can be "ignored" for some time without too much problems (fuel efficiency is a bit reduced).
I fought the same exact thing for about a year and a half.. cleaning MAF, checking vacuum leaks, the whole nine...
just last week, i got tired of the CEL coming on every time I "stepped on it" so I broke down and bought a new MAF before taking it to the show to get smoke tested again...
well.. 400 miles later, still no CEL and cold starts are MUCH better.
it's rare that the air pump itself dies, but I suppose it's possible. the two valves are suspect as well, but if you want an easy DIY and one thing to cross off the list (especially since you stated you had cleaned the MAF, this tells me it's probably dirty/not working), you might just try replacing the MAF sensor.
others will say, "it's not cheap and you're just throwing parts at it", to which I agree with to some extent, but it's nice to "cross it off the list as a possible suspect" and in my case, it solved the problem. 10mins and no more CEL's!
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