Comcast certainly doesn't make it very easy to figure out what service you need to get the channels you want, so I took some time today to figure that out. After a bit of screen-scraping, shell scripting, and a phone call here is all the info. Note that these packages are cumulative so buying a more expensive plan gets you all of the above channels. Also you might be able to get a better deal if you sign up for these packages as a new customer.
Hope this helps someone else!
Digital Starter Channels
2, WGBH-2 (PBS)
3, CN8
3, BAT (Brookline only)
4, WBZ-4 (CBS)
5, WCVB-5 (ABC)
6, WSBK-38 (IND)
7, WHDH-7 (NBC)
8, TV Guide Network
9, CN8 (Brookline only)/BNN TV
10, WLVI-56 (CW)
11, WENH-11 (PBS)
12, Comm. Programming/RAI/SmarTraveler TV
13, NESN
14, New England Cable News
15, ESPN
16, Lifetime
17, CNN
18, WZMY-50 (MyTV)
19, WBPX-68 (ION)
20, C-SPAN
22, The Municipal Channel
23, Community Access/Health Channel-Senior Reading (Brookline only)
24, The Educational Channel/BAT (Brookline only)
25, WFXT-25 (FOX)
26, Cuencavision
27, WUNI-27 (UNI)
28, BET
29, USA Network
30, TBS
31, The Learning Channel
32, TNT
33, Spike TV/EWTN
34, Fox News Channel
36, ABC Family Channel
37, MSNBC
38, CNBC
39, The Weather Channel
40, MTV
41, CNN Headline News
42, E! Entertainment
43, VH-1
44, WGBX-44 (PBS)
45, Boston Catholic TV
46, WWDP-46 (Shop NBC)
47, QVC
48, Comcast SportsNet
49, WYDN-48 (Daystar)
50, WUTF-66 (Telefutura)
51, Swap & Shop/Access
52, WMFP-62 (IND)
53, WNEU-60 (Telemundo)
54, Nickelodeon
55, Trinity Broadcasting/EWTN/RAI
56, TV Land
57, Animal Planet
58, Leased Access
59, Country Music TV
60, Travel Channel
61, HSN
62, VERSUS
63, Food Network
64, The Golf Channel
65, ESPN2
66, Home & Garden TV
67, TruTV
68, Cartoon Network
69, A&E
70, Discovery Channel
71, Disney Channel
72, History
74, FX
75, TVOne
76, Comedy Central
77, Sci-Fi Channel
78, AMC
79, Bravo
80, Spike TV
200, MoviePlex
209, WGBH World ²
217, WGBH Kids ²
237, WGBH Create ²
247, CSPAN 2
267, GSN
268, BCTV
297, WHDH Weather Plus ²
Added in the Digital Classic package ($10.95 extra)
183, Jewelry TV
202, Flix
203, Encore Action
204, Encore Love
205, Encore Mystery
207, Encore Westerns
208, Hallmark Channel
210, National Geographic Channel
211, style.
212, Independent Film Channel
214, TV One
215, Women's Entertainment
218, PBS Kids Sprout
219, G4
220, NickToons
221, Discovery Kids
222, Toon Disney
223, Noggin
224, The N
226, Discovery Health
227, Science Channel
229, Trinity Broadcast Network
232, Fox Reality
234, Jewelry TV by ACN
235, Gospel Music Channel
236, The Word Network
238, EWTN
241, BBC America
244, Soapnet
245, Weatherscan Local
246, Bloomberg
248, ESPNews
249, CSPAN 3
254, Current TV
258, ESPN Classic
271, fuse
272, Urge TV
273, MTV2
275, VH-1 Soul
277, VH-1 Classic
280, MTV Jams
282, CMT
283, Fox Business
326, Encore
705, mun2
711, MTV Tr3s
Added by the Digital Preferred package ($12.95 extra)
201, Sundance
206, Indieplex
216, Oxygen
225, Retroplex
228, Nick TOO
230, FitTV
231, i-Lifetv
233, Planet Green
239, Fine Living Channel
240, Do It Yourself Network
242, History International
243, Biography Channel
252, Investigation Discovery (I.D.)
253, Military Channel
260, TV Games
270, Lifetime Movie Network
276, CMT Pure Country
279, Great American Country
281, Logo
Does not include 705, mun2 from before.
Added by the Digital Preferred with HBO package ($28.45 extra)
301, HBO
302, HBO2
303, HBO Signature
304, HBO Family
305, HBO Comedy
306, HBO Zone
307, HBO Latino
321, STARZ!
322, STARZ! Edge
323, STARZ! in Black
324, STARZ! Kids & Family
325, STARZ! Cinema
327, STARZ! Comedy
870, HBO HD
875, STARZ! HD
Added by the Digital Premier package ($53.45 extra)
341, Cinemax
342, MoreMAX
343, ActionMAX
344, ThrillerMAX
361, Showtime
362, Showtime Too
363, Showtime Showcase
364, Showtime Extreme
365, Showtime Beyond
366, Flix
381, The Movie Channel
382, TMC Xtra
868, Cinemax HD
877, Showtime HD
Does not include 875, STARZ! HD from before.
Added by the Digital Premier with Sports package ($57.45 extra)
213, Turner Classic Movies
250, The Speed Channel
255, Outdoor Channel
256, FOX Soccer Channel
257, NBA TV
259, NHL Network
261, CBS College Sports Network
262, FCS Atlantic
263, FCS Central
264, FCS Pacific
265, NFL Network
266, Tennis Channel
274, BET on Jazz
599, NBA TV
680, TV Globo
714, Gol TV
715, NFL Network
875, STARZ! HD