SJK  Based on feedback you're getting people find your repetitious comments about lack of 64-bit support irritating rather than helpful. Since you care about it so much why not contact developers directly instead of cluttering multiple product comments about it?  
(Version 2.4.5)

CORECODE  it is 64-bit but defaults to starting in 32-bit.

from the FAQ:

Q: How do i run SMARTReporter in 64-bit mode?

A:

SMARTReporter supports running in 64-bit mode on Intel, but by defaults starts in 32-bit mode. To change this use the "Get Info" panel in the Finder on SMARTReporter and uncheck "Open in 32-bit mode".  
(Version 2.4.5)

LIBERTYFORALL1776  Nice find! That is a dumb default behavior that makes no sense.   
(Version 2.4.5)

CORECODE  >That is a dumb default behavior that makes no sense.

of course it makes sense:

• on leopard where all built in apps are 32 bit (except Chess), starting the first 64 bit app incurs a significant overhead: 64 bit versions of all system libraries have to be loaded, taking up megabytes of RAM and taking a while at it. on snow leopard where most apps are 64 bit this point is moot. unfortunately there is no way to default to 32 bit on leopard and 64 bit on snow leopard.

• since SMARTReporter uses nearly no CPU time (and certainly doesn't hit the 32 bit memory limi) the only measurable difference in running the 64 bit version really is that it consumes a tiny amount more RAM

• nevertheless the main reason to defaulting to 32 bit is that the 64 bit version needs testing. if i receive a couple of reports that "everything, including sending e-mails in custom settings mode still works fine in 64 bit mode" i just might make it default.  
(Version 2.4.5)

CORECODE  i've been reluctant to add growl support in the past because growl typically provides transient, easy-to-miss notifications and something as serious as a S.M.A.R.T. error notification has to be delivered in a can't-possibly-miss way, like a dialogue that stays on the screen until it is dismissed.

however i've learned that growl supports many plugins, that can e.g. push notifications to your iPhone and whatnot. so i've changed my mind and put it onto the ToDo list, but i don't think it will be done soon. i'm sure until then you can workaround the issue by using the "Execute application" notification to launch a script/app that triggers a growl notification.  
(Version 2.4.5)

SJK  Simple answer: monitor the console for disk I/O errors on hard drive volumes that can be an indicator of bad blocks eventually leading to irrecoverable data loss.  
(Version 2.3.9)

SJK  Also, disk I/O errors indicating bad blocks can occur before any SMART errors are detected/reported (if ever). I've never seen the latter but have always replaced a drive after seeing recurring and increasing numbers of the former, fortunately without any irrecoverable data loss (thanks to backups or still being able to successful read data from a failing drive).  
(Version 2.3.9)

BILLY RAY VALENTINE  you could always help improve it ;)  
(Version 2.3.5.1)

ARGLBORPS  Same here. I've had quite a bunch of disks failing, none of them ever reported a bad SMART status.

SMART itself appears to be quite useless.  
(Version 2.3.5)

PEN_SQ  I think it's just a matter of what you look at. SMART is pretty good at reporting how heavily it's eating into the spare block count, and once the first regular block is finally broken, the disk is done. Smart may not report the disk as totally No Good until the spindle is finally snapped, but I'm shopping for a new drive the moment the spare count drops. I wish/hope this program does the same.  
(Version 2.3.7)

SFPDOMEY  fixed in 2.2.1

please always send problem reports to me by email (too) since i don't usually monitor various sites (like macupdate) for problem reports.  
(Version 2.2.1)