Update November 9th, 2014. I can confirm that Bindo, Clover, and Silver have now added the following:
Bindo POS: basic invoicing and quoting functions
First Data Clover (still restricted to using First Data for merchant services): Item attributes, modifiers and barcode label printing.
NCR Silver: Barcode label printing and QuickBooks Accounting interface.
Note that some of the added features may require paying an additional fee and/or using third party software.
Not to use recycled terms like "Web 2.0" but I have seen a recent shift in the tablet and smartphone based point of sale systems which I will call "2.0".
While systems like Clover and NCR Silver started the trend of using smartphone and tablet based point of sale systems in retail stores and museums, newer solutions linke Bindo have taken the concept to a more advanced level.
What do I mean?
Initially smartphone and tablet based point of sale systems offered functionality between a cash register and a computer-based point of sale system. Specific missing functions included barcode label printing, item level inventory tracking, and full purchasing/receiving. these are the "1.0" solutions.
"2.0" Solutions like Bindo include these functions while still using the affordable monthy fee payment plan of the the original smartphone and tablet systems.
If you are searching for, or have interest in a smartphone or tablet based point of sale system, please compare the different functions and features of each program (I have a comparison chart available). You may find that a "2.0" solution will accomplish more for about the same price as a "1.0" solution.
Confused/comments/questions? My advice is completely free and based on 15 years of exerience in selling and support multiple different point of sale solutions. You can reach me via email at firstname.lastname@example.org or via voice/text at 208-340-5632 (I am on Mountain Time).