Well, there's no reason to mourn a company per se that ceases, but I do wish some of the development teams that put out good titles were allowed to continue beyond the time allotted to them--regardless of whom they worked for. That goes for the BIS that did PS:T (many of whom got fired within 6 months of that game's appearance), for example.
Part of BIS went and formed Obsidian, who are now working on KotOR2. A member or two went in Silver Style. The rest parted in different directions: one went into Pen and Paper RPG, another joined Bioware, others created some other company, along with former Looking Glass employees (NWN: Shadows of the Undertide expantion is their work)...
