You need to use ALT attributes if your going to be section 508 compatable

Enter a HTML description or replacement of the object inside the object tag.

You should use the title tag to explain your object.

Nesting CFLOCK tags may cause a deadlock, which will crash your server.

If there is a variable in the CFERROR template it will throw an error.

You must use an absolute url in the URL attribute of CFSCHEDULE

CFTRANSACTION tags cannot be nested if the inner transaction action is BEGIN

The OnRequestEnd.cfm file must be in the same directory as the Application.cfm file

The template in the CFINCLUDE or CFERROR tag does not exist.

Query strings will not be processed within a cfinclude

You should use the maxlength attribute in your form elements

Some tags implicitly define cfoutput for you such as cfmail, and cfquery

Although it is syntatically correct to omit the column list, it leads to difficult maintenance

The ParameterExists function has been deprecated since CF4, use IsDefined("var") instead

Use the HINT attribute to document a CFC or Function

Use the DISPLAYNAME attribute to document a CFC or Function

The IIF function is slower, and less readable than using conditionals

Using SELECT * often returns more columns than necessary.

Use the equals operator in the CFSET tag instead for a speed and readibiliity increase.

StructFind is slower and less readable than dot or bracket notation.

Variables that resolve to true/false,yes/no, or 1/0 can be treated as booleans. Use cfif var, or cfif NOT var instead of cfif var IS true.

IncrementValue is very slow use the addition operator inside of cfset instead.

Set the allow overwrite argument to true for a speed increase

Use the Len function instead of IS ""

UNIX have case sensitive file systems you must use Application.cfm with a capital A

UNIX have case sensitive file systems you must use OnRequestEnd.cfm

The template path in CFINCLUDE is case sensitive on unix.

Using CFQUERYPARAM both increases performance, and prevents common security vulnerabilities.

Without the accept attribute it is possible for users to upload files of any type.

Pound Signs only need to be used in CFSET or CFIF Tags when they are contained within qoutes. They also have slight performance implications.

Closing tags are recommended on tags such as li, and option.

Quotes are not needed around numbers in expressions.