Lidstrom and datsyuk were suspended for a game for not attending the all star weekend. They figured they'd just get the rest instead of playing in a meaningless game (because they were either injured or just coming off of injury). Crosby didn't attend either because at the last second bettman made a new rule saying if you at least show up there, there would be no suspension. Had lids and dats known this, they could have avoided a 1 game suspension by just showing up like poster girl criesby. Bettman didn't make this rule widely known. Only crosby seemed to know about this rule, and lids and dats sat a game for him playing favorites and only letting his girlfriend in on this secret rule. But SHHHH.....bettman doesn't want you to know : )
To add some details:
Prior to that season (can't remember, 07-08?), the GMs and the league came up with a rule that stated that if you're selected to the ASG or its on-ice activities, you have to play in them or sit out the game after the ASG; we only knew about this rule after Lidstrom and Datsyuk would be suspended. IIRC, they were going to take the suspension because of the injuries they had (Lidstrom had tendonitis in his elbow, I believe, can't remember what Datsyuk's injury was). A day or so before the ASG activities, Crosby announced that he would be sitting it out, as well as the game following it, because of an injury (thinking knee or lower body, can't exactly remember). Again, the GMs all knew the rule and had no problem with it.
Well, then the league decided, well past the last minute, to change the rule so that you only have to attend the ASG festivities, not play in the ASG or other on-ice activities. That saved Crosby (and the Penguins) from having their star sit out the following game (were they outside the playoffs at that point? Can't remember). Lidstrom and Datsyuk were already out of the country and couldn't/wouldn't get back to attend the festivities.
Again, the league and the GMs came up with the "sit out the following game if you don't play in the ASG if selected" rule, but it was the league that amended the rule after Crosby announced his non-attendance. This, along with other previous cases where the Penguins/Crosby benefited from something shady/questionable, helps contribute to the "pro-Penguins/pro-Crosby league" conspiracies.