the one thatll be most impactful in all of video gaming history;
xfire streaming
was the first easy to use service to stream games. The
only reason Twitch.tv was even made in the first place is cause no one viewed justin.tv (owner of twitch.tv) as a site to view gamers, even though the option was there. Xfire(pwned.tv was popular but no where near as popular) was killing the game in streaming for an entire year between Call of Duty and World of Warcraft. All the top streamers you see on twitch.tv today were popular streamers on xfire first. The problem with xfire though they werent paying them out. Streamer could have 3,000 viewers and make pennies literally. Twitch.TV offered a better pay plan and better options right off the bat. Buried xfire almost immediately and now the general population doesnt know that twitch.tv only exists because of a program called xfire which was real popular in the early to mid 2000s ( think aol instant messenger but for video games, its how everyone stayed in contact before Steam blew up to what it is today) that got reinvigorated when MTV bought them out and allowed streaming on it.
I will say this though about twitch.tv... they better watch themselves... the people viewing their site are not loyal to their site, they are loyal to the gamers.. if the top streamers went to another streaming site that offered even MORE money then the viewers would go with them as well. They can get xfire'd themselves even though in the near future its unlikely.
This is where twitch is messing up at.. They offer more ways for people to stream now (consoles, showing people how to use programs to stream, etc.)
they advertise all the time to bring in new streamers. The problem though, is they give these new streamers
no way to be seen or heard of. So no one even knows their streaming.. its like twitch.tv whores out little streamers just for the beginning commercial ad revenue
They did make it easier to become partnered and get revenue from ads
but they dont fix the issue where no one will ever see your stream because the viewers are all saturated to 1-5 players on each game during a point in the day.
What a lot of people dont know is when twitch.tv first started blowing up, they DID make it easier for streamers to get known or at least have a shot at it by letting them on the front page.
if you go to twitch.tv right now the only streamers youll see are 6 partnered people with twitch rotating with other partnered people with twitch. Before if you had your stream on for a decent amount of time oyu had a chance to make it to the frontp age regardless if you had 120 total views or 1.2 million total views.
, Sega gave us a glimpse of the DLC era 
VMU plus crazy next gen quality graphics and online play. Should have been bigger but didnt play dvds and PS2 was just too popular 
though. 6 AAs lasted maybe 2 hours tops.
it was good and well timed but adding a HD wasn't a worldbreaker
