In Utero for me. It's such a great album. Radio Friendly Unit Shifter rocks. For those into downloading torrents, here's a cool site that is almost completely Nirvana.
http://onemoresolo.net/ Get the Loose Ends Compilation. It's way better than WTLO. There are a lot of insanely dedicated fans in the Nirvana community. edit:What the fuck? I pushed "enter" to separate some sentences and the board automatically puts everything together. This has been happening for the last couple of days. Even if I edit my posts, they still come up like this.