Is it possible to have 2 or more databases active, and synchronized between them? edit
I'm testing possible solutions for database redundancy and high availability,I tested mirroring it worked fine, but lacks scalability plus there will be a lot of work in one server. Now I discovered Merge Replication, and in paper looks great (although I still need to know what happens if a server goes down and them comes alive again, will it synchronize? can you answer me to this one too?) 

edit

My objective is to have various applications working simultaneous and communicating with one database only. But having the databases synchronized between them and that in case of one database goes down, all its data is not lost.



Is it possible to do this with Merge Replication?? where all sql instances are both publishers and subscribers, and have an distributor inside them.

Any considerations I should take, or other possible solutions for my problem?

regards
SQL Server scales up not out
HA/DR is separate to scaling
Replication is not designed to publish entire databases
Replication or mirroring add an overhead that defeats your scaling out
Merge replication will have conflicts at some point


Personally, I'd buy a bigger server, go Enterprise x64 edition, and wait for SQL Server 2012 HADRON