SSD for Latitude D620. Am I crazy?

Your SATA connection will either be SATA1 or SATA2. That's either 150MB/second or 300MB/second.

You could ask DELL which one you have. There's a good chance it's SATA1.

You need to be very picky about what SSD drive you get. There are very few good ones. Many have issues. Make sure to read reviews.

Personally, if I had about $300 I would get this drive:

OCZ Vertex 120GB (Read 200MB/second, Write 160MB/second)

If you have SATA1 it will max out your connection, if you have SATA2 it will be a little faster but this drive is awesome. Even with SATA1 it's awesome.

The most important things are:
1) Quality of build
2) Longevity
3) Speed
4) No stuttering

Again, read reviews. 90% or more of the drives on the market have major issues.

Thanks for the advice. I actually talked to a dell "tech guy" earlier today and he thought throughput was "2.5". I had to explain to the gentleman that 2.5 was the form factor. I'm 99.99% sure I have SATA1. I'm just trying to decide If a SSD is going to give me more life for the laptop or If I should just buy a new laptop in 6 months with Win7 and SSD.

Also I'm the default "tech guy" at our small biz (accounting) and I like to geek out and build computers.

My biggest complaint is that we all use docking stations with dual monitors at work and Dell has conveniently decided that the new generation of their workforce laptops will use a new version of the docking station that will be incompatible with our D620's.

Even if it is SATA I, you're still going to see enormous performance gains. The only thing you'll be bottlenecked on is sequential reads, and sequentials rarely take effect.

I would check out some of these articles before you make a decision on an SSD. They're lengthy but awesome reads.

http://www.anandtech.com/storage/showdoc.aspx?i=3403
http://www.anandtech.com/storage/showdoc.aspx?i=3535
http://www.anandtech.com/storage/showdoc.aspx?i=3607

edit: What you linked is not what you want. That's a G1, you'll want the G2. The G2s are all out of stock for just a week or two, Intel is fixing a minor bug with a firmware update. The 80GB retails for $225 and outperforms the G1.

edit2: Type fail.