>>11
If it's a "J2EE" (or JEE now, hah) server, expect lots of suck. WebLogic and JBoss are probably the least sucky of them.
Sun gets used for only 1 reason: Politics.
Sun is years behind everyone in technology, including their "new" T1 (tip: get opterons now instead or wait for the next-gen pentiums, once you cut through the bullshit on the front and understand how and why cpus are built the way they do, you'll find that the T1's design is in fact, horrible.), their "most advanced operating system" Solaris 10, is also on a similar level of bullshit. If "most advanced" means pre-Win2k, then sure.
Let's not even get started on their horrible usability and maintanence, the worthlessness of Sun "certified" engineers, etc.
Sun is beginning to talk about implementing self-maintaining and configuring software; stuff the rest of the world has had since the last decade.