what is the best approach to send report by Email? I've been requested to create some sql server reports ( create a report and send them by email ) for some poeple. I thought it would be like 2 or 3 but now that they know I can do it, every week I need to create 1 or 2 more reports.
I use SQL Agent and some steps to create a table, populate with the desired results, then I send it inside a xls file. Thats really not a problem, But I would like to know what can be better used for this task, since now I have more then 20 jobs on my SQL Agent. its all well organized and etc but still, I dont like to be looking at it. I already have a lot of DBA jobs and I dont want to mix things.
Is reporting services a viable way to do this? can I normally create a query, them send it to an excel file and send it by email without using c# or visual studio?
Yes sure.. you can use the subscription and delivery of Reporting Services to send a report.
The available formats are:

XML file with report data
CSV (comma delimited)
PDF
MHTML (web archive)
Microsoft Excel
TIFF file
Microsoft Word

(source)
For delivery via email look here.