Ordinarily I'd say keeping a close eye on the limit is a good idea, but this year may be the exception.
If your limit is, say, 1450 ip and you're on pace to match that total, you'll be out a whole lot of innings (and stats) if there is in fact a lockout - or strike, or "work stoppage," or whatever word they'll choose this time (how about non-playing interlude?) - later this season. If you use up a large portion of your allotment early, you'll be less flexible later, but in the case of a strike, you'll have a huge edge over teams that pace themselves normally. If there is no strike (hopefully), you can always deal pitchers for hitters before your trade deadline.
Unfortunately, this tactic may be key to winning a league this year. Sad as it is, fantasy players will have to adjust while hopßing for the best.