Jason Stanley said that 27.

i.e. that "27" is the number of his publications, as per his site, accessed.

Some running commentaries:

27. Singular Thoughts and SINGULAR PROPOSITIONS. Forthcoming in Philosophical Studies (with Joshua Armstrong)

26. "Knowing (How)", forthcoming in Nous. Stanley has a book on "Know how".

25.“’Assertion’ and Intentionality”, Philosophical Studies 151.1, 2010: 87-113. Grice was obsessed with that. After all, most Oxonian philosophers were. But Grice is reminiscent of this in his "Retrospective Epilogue" to WoW, where he lists "assertion" as the first topic of his philosophical interest.

24. "On 'Average'", Mind 118, 2009: 583-646 (with Christopher Kennedy)

23. "Knowledge and Action", The Journal of Philosophy 105.10, 2008: 571-590. (with John Hawthorne)

22. "Knowledge and Certainty", Philosophical Issues 18, 2008: 33-55. Grice was concerned with, er, UNcertainty, as in "Intention and Uncertainty". We are certain that some intentions are uncertain.

21. "Philosophy of Language in the Twentieth Century", in Dermot Moran (ed.), The Routledge Companion to Twentieth Century Philosophy (London: Routledge Press, 2008): 382-437.
-selection reprinted as "Frege, Russell, and Tarski" in The Routledge Companion to the Philosophy of Language, edited by Delia Fara and Gillian Russell (London: Routledge Press, 2011)

----- A good thing about Grice, unlike Witters, is that Grice's life span belongs to the 20th century, so-called. Born in 1913, died in 1988. In this, he contrasts with Strawson who while born in the 20th century (1919) died in the 21st century, complicating matters.

20. "Hornsby on the Phenomenology of Speech", Proceedings of the Aristotelian Society, Supplementary Volume (2005): 131-45.

--- Hornsby (a female) studied at Oxford with J. O. Urmson. She is a lovely philosopher.

19. "Semantics in Context", Contextualism, G. Peters and G. Preyer, ed. (Oxford: Oxford University Press, 2005): 221-53. Repr.

18. "Fallibilism and Concessive Knowledge Attributions", Analysis 65.2, 2005: 126-31.

17. "Semantics, Pragmatics, and the Role of Semantic Content", in Semantics vs. Pragmatics, Z. Szabo, ed. (Oxford: Oxford University Press, 2005) (with Jeffrey C. King)

16. "On the Linguistic Basis for Contextualism", Philosophical Studies, 119, 2004: 119-146.
--- As opposed to ... the WHAT other basis? Epistemic. Ontologic. Whatever. Lovely essay.

15. "Context, Interest-Relativity, and the Sorites", in Analysis 63, 2003: 269-280.

14. "Modality and What is Said", in Philosophical Perspectives 16, J. Tomberlin, ed. (Blackwell Press, 2002): 321-344.
----- Hare would have loved this. Hare wrote an essay for Urmson, "Subatomic particles of logic". It was rejected because he used too many obscure symbols. He published it, instead, in _Mind_, and repr. in Universal Prescriptions.

For Hare, the what-is-said is the 'phrastic'. A better term, actually. Classier.

13. "Nominal Restriction", in LOGICAL FORM and Language, G. Peters and G. Preyer, ed. (Oxford: Oxford University Press, 2002): 365-388.

12. "Making it Articulated", Mind and Language 17 1 & 2, 2002: 149-168.

11. "Hermeneutic Fictionalism", in Midwest Studies in Philosophy 25: Figurative Language, H. Wettstein and P. French, ed. (Blackwell Press, 2001): 36-71.

10. "Knowing How", Journal of Philosophy 98, 2001: 411-444 (with Timothy Williamson)
-reprinted in The Philosopher's Annual XXIV. P. Grim, P. Ludlow, and G. Mar (ed.), Stanford, CSLI: 237-272.
(Williamson was born in Stockholm, of Brit parents).

9. "Context and LOGICAL FORM", Lingustics and Philosophy 23.4, 2000: 391-434.
- reprinted in Pragmatics: Critical Concepts II, edited by Asa Kasher (Routledge, 2010)

8. "On Quantifier Domain Restriction", Mind and Language 15 2 & 3, 2000: 219-261. (with Zoltan Gendler Szabo)

7. "Understanding, Context-Relativity, and the Description Theory", Analysis 59, 1999: 14-18. Cfr. Grice on "Definite descriptions in Russell and in the vernacular"

6. "Persons and their Properties", The Philosophical Quarterly 48, 1998: 159-175.

5. "Names and Rigid Designation", A Companion to the Philosophy of Language, Hale and Wright, ed. (Oxford, Blackwell Press, 1997): 555-585.

4. "Rigidity and Content", in Language, Thought, and Logic: Essays in Honor of Michael Dummett, R. Heck, ed. (Oxford: Oxford University Press, 1997): 131-56.
--- Grice would recount that Dummett was never invited to Austin's playgroup. Perhaps because he was a Catholic?

3. "Truth and Metatheory in Frege", Pacific Philosophical Quarterly 77, 1996: 45-70.
-reprinted in Gottlob Frege: Critical Assessments of Leading Philosophers,
M. Beaney and E. Reck (eds.) Routledge, 2005: 109-35.

2. "Quantifiers and Context-Dependence", Analysis 55, 1995: 291-5 (with Timothy Williamson)

1. "Frege and Second-Order Logic", Journal of Philosophy, 90, 1993: 416-424 (with Richard Heck)

Etc.