multiple inqs for credit cards are -not- treated as a single inq as listed above; that only applies to auto loans and mortage loan inqs over a short time period(2 weeks, maybe 4, if memory serves).
Since more than 2 inqs will start dropping your fico score(usually 2-3 points per inq), you would be wise to check your scores for each credit bureau at myfico.com before you start opening zillions of card accounts.