They were talking about this on the Dan Patrick show yesterday, and mentioned the following as the best #1 and #2 starter combos this season.

Detroit Tigers

Kenny Rogers

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	16	104.2	94	43	12	25	59	10	3	0	96.7	1.14	.243	3.44
Justin Verlander

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	16	103.2	94	38	11	31	65	10	4	0	98.3	1.21	.248	3.13
Boston Red Sox

Josh Beckett

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	16	97.0	83	55	20	31	82	10	3	0	97.8	1.18	.226	4.64
Curt Schilling

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	17	114.1	110	45	15	14	102	10	2	0	107.2	1.08	.253	3.54
Minnesota Twins

Francisco Liriano

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	20	73.1	56	18	5	19	82	8	1	1	91.1	1.02	.212	2.21
Johan Santana

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	17	118.1	94	36	12	20	124	9	4	0	102.8	0.96	.216	2.59
New York Mets

Tom Glavine

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	17	107.2	101	42	15	33	75	11	2	0	102.0	1.24	.251	3.34
Pedro Martinez

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	16	101.2	74	44	14	28	111	7	4	0	98.5	1.00	.202	3.45

Those were the top #1 and #2s named on the Dan Patrick show. I however, think that there is another big #1 and #2 starting pitcher combo that has been huge for their team this year, and their numbers compare very evenly with the above named combos (with the exception of the Twins, but they were stupid and waited too long to put Liriano in the rotation).

Cincinnati Reds

Bronson Arroyo

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	17	118.2	107	38	12	26	89	9	4	0	109.9	1.12	.239	2.58
Aaron Harang

Code:
SPLIT	G	IP	H	R	HR	BB	SO	W	L	Sv	P/GS	WHIP	BAA	ERA
Season	17	112.1	113	52	11	28	109	9	5	0	107.8	1.26	.267	3.45
The Reds have one of the five best top of the rotation #1 and #2 combos this year, yet no mention of them in the conversation. These two could be the cornerstone of this starting rotation for years, and make it a very good rotation. I think Arroyo and Harang have been the difference on this team between contender and cellar dweller this year. How huge they've been to this team's success is easy to see, yet they still get no love in the media. Shame.