Kripke most recently, but since 2000, we have also lost Quine, Rawls, D.K. Lewis, P.F. Strawson, Dummett, Putnam, Davidson, B. Williams, Fodor, among others. From that generation (born 1940 or earlier), the only philosophers of comparable stature who are still with us are David Kaplan, Thomas Nagel, and T.M. Scanlon. I am reminded of this observation by Harry Frankfurt from a few years back:
In the United States, even after interest in William James and John Dewey had receded, there was lively attention to contributions by Willard Quine and Donald Davidson, John Rawls and Saul Kripke. In addition, some philosophers were powerfully moved by the gigantic speculative edifice of Whitehead. Heidegger was having a massive impact on European philosophy, as well as on other disciplines--and not only in Europe, but here as well. And, of course, there was everywhere a vigorously appreciative and productive response to the work of Wittgenstein.
The lively impact of these impressive figures has faded. We are no longer busily preoccupied with responding to them. Except for a few contributors of somewhat less general scope, such as Habermas, no one has replaced the imposingly great figures of the recent past in providing us with contagiously inspiring direction. Nowadays, there are really no conspicuously fresh, bold, and intellectually exciting new challenges or innovations. For the most part, the field is quiet. We seem, more or less, to be marking time.
Frankfurt's remarks provoked a lively discussion last time, but I'll invite further comments on this occasion as well.
CLARIFICATION: I am inviting comments on Frankfurt's assessment, not who else belongs on the list of pre-1940 greats. Sorry for being unclear about that.