Alliteration in the same sentence or phrase is absolutely fine. Having a lot of options in the same menu or the same drop down that start with the same letter, it's not a problem. If you've just got a few things that start with an L, I wouldn't imagine that would be too much trouble for anybody. But one of the ways screen readers can quickly move to an item within a combo box, for example, is to use first letter recognition. So obviously if you have 25 things and they all start with thesame letter, you kind of remove that capability. It's troublesome, but it'sNot a showstopper, but unlikely.