I'm a newbie - aren't all Shimano 105 shifters the same?

[badgercat]

From 2000 they will be 9-speed shifters, and now 105 (and all shifters that Shimano makes) are for 10-speed. So they are different and potentially hard to find.

Pardon the hijack, but from what I'm seeing on Shimano's website, Sora and Tiagra shifters are still 9-speed... I had to go and research because my 2009 Jamis has 9-speed Sora and I was scared that it was already completely obsolete.