This year has already brought more first-time sub 4's for US runners than any other year.
The US is currently up to 13 this year:
2007 (13)
284. Nick Symmonds *3:56.72i (1) Seattle, WA Jan 13
285. Garrett Heath *3:59.60i (2) Seattle, WA Feb. 10
286. Blake Boldon *3:59.18i (1) Ames, IA March 03
287. Joshua McDougal 3:57.46 (1) Lynchburg, VA March 31
288. Lopez Lomong 3:58.54 (1) Tempe, AZ Apr. 14
289. David Torrence 3:58.62 (1) Berkeley, CA Apr. 28
290. Michael Kerrigan 3:59.60 (2) Swathmore, PA May 14
291. Jeff See 3:58.70 (2) Nashville, TN June 02
292. Jake Watson 3:59.40 (3) Nashville, TN June 02
293. Ben Gregory 3:59.69 (4) Nashville, TN June 02
294. Sean Graham 3:58.4 (2) Beaverton, OR June 10
295. Ben True 3:59.99 (1) Cambridge, MA June 17
296. Seth Summerside 3:57.84 (4) Brasschaat, Belgium July 21
Prior to 2007, the record was 12 people, which was first achieved in 1973, then later in 1991, and finally last year in 2006.
1973 (12)
51. Tony Waldrop (NC)...........3:58.4.....(1)..Raleigh.......Apr 21
52. Reggie McAfee (NC)..........3:59.3.....(2)..Raleigh........Apr 21
53. Barry Brown (FlTC)..........*3:58.8....(2)..Gainesville.....May 13
54. Mark Feig (Or)..............3:59.5.....(3)..Eugene.........May 19
55. Tommy Fulton (TxSn).........*3:57.8....(1)..Arkadelphia.....May 25
56. Charlie McMullen (Mo).......3:59.7.....(1)..East Lansing....May 26
57. Rick Wohlhuter (UCTC).......3:58.8.....(1)..Wichita...........Jun 2
58. Dick Buerkle (NYAC).........3:58.0.....(1)..Gainesville.......Jun 4
59. Mark Schilling (SJSt).......*3:58.6....(6)..Baton Rouge.......Jun 9
60. Paul Geis (OTC).............*3:58.0....(4)..Eugene..........Jun 20
61. Jim Johnson (CNW)...........*3:58.8....(6)..Eugene.........Jun 20
62. Scott Daggatt (Or)..........3:59.6.....(7)..Eugene..........Jun 20
1991 (12)
172. Matt Taylor (Fox)..........*3:57.84i..(2)..Fayetteville.....Jan 25
173. Bill Burke (Prin)..........3:58.70i...(1)..New York.........Feb 1
174. Mark Deady (NITC)..........*3:58.65i..(1)..Boston...........Feb 16
175. Charles Marsala (NITC).....*3:58.73i..(2)..Boston...........Feb 16
176. Mike Michno (NBal).........*3:58.94i..(3)..Boston...........Feb 16
177. Bill Rathbun (BAA).........*3:59.94i..(4)..Boston...........Feb 16
178. Bob Kennedy (In)...........3:58.11i...(1)..Indianapolis......Mar 9
179. John Trautmann (Gtn).......3:58.52i...(4)..Indianapolis......Mar 9
180. Matt Giusto (Miz)..........3:59.18....(3)..Stanford.........Mar 30
181. Gerry Donakowski (NikN)....*3:59.1....(4)..Dedham............Jun 9
182. Terrance Herrington (NikA).3:55.61....(8)..Vill.-d'Ascq......Jul 1
183. Chr. Cushing-murray (SMTC).3:57.70....(10).Vill.-d'Ascq......Jul 1
2006 (12)
272. Sean O’Brien *3:59.05i (3) Seattle, WA Jan. 14
273. Elliot Blount *3:59.61i (4) Seattle, WA Jan. 14
274. Chris Lukezic 3:58.53i (10) Boston (Roxbury), MA Jan. 28
275. Ryan Kleimenhagen 3:59.00i (11) Boston (Roxbury), MA Jan. 28
276. Russell Brown 3:59.65i (3) Fayetteville, AR Feb. 10
277. Austin Abbott *3:59.47i (4) Seattle, WA Feb. 11
278. Stephen Pifer *3:59.55i (5) Seattle, WA Feb. 11
279. Michael McGrath *3:59.25i (1) Seattle, WA March 04
280. Christian Smith *3:59.60i (2) Ames, IA March 04
281. Jason Jabaut 3:59.07 (4) Beaverton, OR May 04
282. Matthew Tegenkamp 3:56.38 (1) Madison, WI May 06
283. Chris Solinsky 3:57.80 (2) Madison, WI May 06
The most amount of first-time sub 4's over a 2 year span used to be in 1973 + 1974 having a combined total of 23 people. Now, 2006 + 2007 have been the best 2 successive years with 25 people.
I got the majority of this info from Track&fieldnews.com, and have tried to continue the list from where they left off (#264). Just thought some of you might find it interesting!