When it’s an Update. This year, Service Packs are called Updates, and the first one for AutoCAD is out now. The 32-bit version is here and the 64-bit version is here. The Update includes LT, but there is no news yet about Updates for any of the vertical AutoCAD variants.
As usual, read the Readme first. Also, as this Update has had a considerably shorter gestation period than the traditional six-month wait for the first AutoCAD Service Pack, you may be wise to exercise more paranoia than normal. Save and export your AutoCAD profiles, save your workspaces, make backups of your CUI files and put them somewhere safe where AutoCAD and the Update can’t find them.
Does the shortened time before the first Update indicate that there will be more Updates in store? Probably. Although Update 1 (U1) fixes a lot of stuff, there’s still plenty more stuff left to fix in 2009. Oh, and just because it says in the Readme that something is fixed, don’t take it for granted that your particular variant of that problem is fixed. Try it out for yourself.
I know that many of you don’t put an AutoCAD release into production until SP1 is released, so should you go now with U1 or wait for U2? (No, not the band). Or U3, even, if there ever is one? It’s up to you, of course, but in my own CAD management role I won’t be distributing AutoCAD 2009 with U1 to my users. I just don’t think it’s ready yet.