I'm just curious, is t-test planed to be implemented in this great add-in?
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Excel has built-in support for Student's t test: simply type =ttest(data1, data2, param1, param2) in a cell (where data1 and data2 designate the cell ranges with the data in it; for information on the parameters, please see the Excel help text).
If you are using Excel 2010, you can also use the new function =t.test (note the period after the first t); however, for backwards compatibility, the old ttest function is available in Excel 2010 also.
By the way, you can also use the ANOVA to analyze just two groups - it will produce the very same p value as the t test.