I used Inkscape to create the map.
Thanks for pointing out the error with 23rd Street, I'll fix that soon.
I want to put "unique" ideas on the map, not just small changes to existing routes or adding SBS to a route. A perfect example of unique would be some of the ones created by FamousNYLover, such as the M18 or X82/X83.
The M6 idea is basically the M5 south of 72nd Street, and the M55 SBS is basically an M5 SBS. Not saying that those routes aren't good ideas or anything, just saying that I want more creative ones so the map doesn't get too cluttered with routes close to what currently exists today. B)
Updated map: http://scaped.net/mta/colab.pdf
I also think that it's worth mentioning that I see a common theme in all of the routes I've mapped. Almost all of them use 42nd Street and the only avenues used in Midtown are 7th and 8th, with only one (the X83) using 9th. Also with the M25 and M26 (both created by different people), they were both trying to provide a service to combine the X25 and X26 routes into one, one of them decided to use the FDR Drive and the other decided to use West Street. Also, so far any bus that goes to Lower Manhattan travels via the M20 to South Ferry.