Side by side is fine, as Juan has mentioned.
When you install the redist, I believe it leaves 1.1 for current webs (1.1
upgraded all 1.0 webs, so it operated a bit differently). You can also run
aspnet_regiis -i under the 2.0 directory and have all webs run under 2.0. You
can also selectively choose which run under which version of the framework
using the same tool or assigning individually in ISM, etc.
As long as you have not hit a rare forward breaking change, you can deploy
1.1 to 1.1 or 2.0, but realize that a recompile in 2.0 is the best way to go
if you are going to run under 2.0.
As for adding 2.0 pages to current apps? Only if you upgrade the app to 2.0.
You cannot have 2.0 built pages run under 1.1 when compiled for 2.0. You can,
however, develop in 2.0 and compile in 1.1, provided you use no new features.
Best best is to migrate 1.1 code to 2.0 and add the new 2.0 features and then
deploy to 2.0.
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
***************************
Think Outside the Box!
***************************